diff --git a/DUDUJI.xcodeproj/project.pbxproj b/DUDUJI.xcodeproj/project.pbxproj
index cb26567..65f5f11 100644
--- a/DUDUJI.xcodeproj/project.pbxproj
+++ b/DUDUJI.xcodeproj/project.pbxproj
@@ -17,6 +17,8 @@
 		24D4D3CC29ABBA800064E566 /* MastodonSwift in Frameworks */ = {isa = PBXBuildFile; productRef = 24D4D3CB29ABBA800064E566 /* MastodonSwift */; };
 		24D4D3CE29ABBC030064E566 /* InstanceApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 24D4D3CD29ABBC030064E566 /* InstanceApp.swift */; };
 		24D4D3D029ABC01E0064E566 /* AddAccountView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 24D4D3CF29ABC01E0064E566 /* AddAccountView.swift */; };
+		24D4D3D429AF97A40064E566 /* InstanceAppViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 24D4D3D329AF97A40064E566 /* InstanceAppViewModel.swift */; };
+		24D4D3D629AFA1970064E566 /* InstanceAppManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 24D4D3D529AFA1970064E566 /* InstanceAppManager.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -31,6 +33,8 @@
 		24D4D3C829ABB7590064E566 /* Const.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Const.swift; sourceTree = "<group>"; };
 		24D4D3CD29ABBC030064E566 /* InstanceApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InstanceApp.swift; sourceTree = "<group>"; };
 		24D4D3CF29ABC01E0064E566 /* AddAccountView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AddAccountView.swift; sourceTree = "<group>"; };
+		24D4D3D329AF97A40064E566 /* InstanceAppViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InstanceAppViewModel.swift; sourceTree = "<group>"; };
+		24D4D3D529AFA1970064E566 /* InstanceAppManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = InstanceAppManager.swift; path = DUDUJI/Models/InstanceAppManager.swift; sourceTree = SOURCE_ROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -64,6 +68,7 @@
 		24D4D3B329AB83E80064E566 /* DUDUJI */ = {
 			isa = PBXGroup;
 			children = (
+				24D4D3D229AF8E9D0064E566 /* ViewModels */,
 				24D4D3D129ABC0280064E566 /* Views */,
 				24D4D3C529ABB5830064E566 /* Models */,
 				24D4D3C829ABB7590064E566 /* Const.swift */,
@@ -87,6 +92,7 @@
 		24D4D3C529ABB5830064E566 /* Models */ = {
 			isa = PBXGroup;
 			children = (
+				24D4D3D529AFA1970064E566 /* InstanceAppManager.swift */,
 				24D4D3C329ABAE5A0064E566 /* AccountInfo.swift */,
 				24D4D3C629ABB6500064E566 /* OauthToken.swift */,
 				24D4D3CD29ABBC030064E566 /* InstanceApp.swift */,
@@ -102,6 +108,14 @@
 			path = Views;
 			sourceTree = "<group>";
 		};
+		24D4D3D229AF8E9D0064E566 /* ViewModels */ = {
+			isa = PBXGroup;
+			children = (
+				24D4D3D329AF97A40064E566 /* InstanceAppViewModel.swift */,
+			);
+			path = ViewModels;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -185,6 +199,8 @@
 				24D4D3B529AB83E80064E566 /* DUDUJIApp.swift in Sources */,
 				24D4D3C929ABB7590064E566 /* Const.swift in Sources */,
 				24D4D3D029ABC01E0064E566 /* AddAccountView.swift in Sources */,
+				24D4D3D629AFA1970064E566 /* InstanceAppManager.swift in Sources */,
+				24D4D3D429AF97A40064E566 /* InstanceAppViewModel.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/DUDUJI/DUDUJIView.swift b/DUDUJI/DUDUJIView.swift
index c836791..ab43814 100644
--- a/DUDUJI/DUDUJIView.swift
+++ b/DUDUJI/DUDUJIView.swift
@@ -10,11 +10,7 @@ import SwiftUI
 struct DUDUJIView: View {
     var body: some View {
         VStack {
-//            TextField(Text("server address"))
             AddAccountView()
-            Button("Login") {
-                print("123 \(Date().debugDescription)")
-            }
         }
         .padding()
     }
diff --git a/DUDUJI/Models/AccountInfo.swift b/DUDUJI/Models/AccountInfo.swift
index 58e1be1..093a893 100644
--- a/DUDUJI/Models/AccountInfo.swift
+++ b/DUDUJI/Models/AccountInfo.swift
@@ -7,8 +7,7 @@
 
 import Foundation
 
-public struct AccoutInfo {
-    public let id: String
+public struct AccountInfo {
     public let username: String
     public let serverAddress: URL
     public let oauthToken: OauthToken?
diff --git a/DUDUJI/Models/InstanceApp.swift b/DUDUJI/Models/InstanceApp.swift
index 55970b6..a65ad01 100644
--- a/DUDUJI/Models/InstanceApp.swift
+++ b/DUDUJI/Models/InstanceApp.swift
@@ -7,8 +7,7 @@
 
 import Foundation
 
-public struct InstanceApp {
-    public let id: String
+struct InstanceApp {
     public let name: String
     public let website: URL?
     public let redirectUri: String
diff --git a/DUDUJI/Models/InstanceAppManager.swift b/DUDUJI/Models/InstanceAppManager.swift
new file mode 100644
index 0000000..739a6d1
--- /dev/null
+++ b/DUDUJI/Models/InstanceAppManager.swift
@@ -0,0 +1,19 @@
+//
+//  InstanceAppManager.swift
+//  DUDUJI
+//
+//  Created by ching on 2023/3/1.
+//
+
+import Foundation
+
+class InstanceAppManager {
+    func createInstanceApp(at serverAddress: String) {
+        print("服务器地址是\(serverAddress)")
+        // save things to InstanceApp model
+        // let instanceApp = InstanceApp(id: xxx....)
+        let instanceApp = InstanceApp(name: "name", website: nil, redirectUri: serverAddress, clientId: "abc", clientSecret: "cba")
+        // save the instanceApp to database
+        print(instanceApp.name)
+    }
+}
diff --git a/DUDUJI/ViewModels/InstanceAppViewModel.swift b/DUDUJI/ViewModels/InstanceAppViewModel.swift
new file mode 100644
index 0000000..9794c9c
--- /dev/null
+++ b/DUDUJI/ViewModels/InstanceAppViewModel.swift
@@ -0,0 +1,18 @@
+//
+//  InstanceAppViewModel.swift
+//  DUDUJI
+//
+//  Created by ching on 2023/3/1.
+//
+
+import SwiftUI
+
+class InstanceAppViewModel: ObservableObject {
+    private let instanceAppManager = InstanceAppManager()
+
+    // MARK: intents
+
+    func createInstanceApp(at url: String) {
+        instanceAppManager.createInstanceApp(at: url)
+    }
+}
diff --git a/DUDUJI/Views/AddAccountView.swift b/DUDUJI/Views/AddAccountView.swift
index 2d1186a..9467205 100644
--- a/DUDUJI/Views/AddAccountView.swift
+++ b/DUDUJI/Views/AddAccountView.swift
@@ -8,17 +8,35 @@
 import SwiftUI
 
 struct AddAccountView: View {
-    @State private var serverAddress: String = ""
+    @State var serverAddress: String = ""
+    @StateObject var instanceAccountViewModel = InstanceAppViewModel()
 
     var body: some View {
         Form {
-            TextField("server address", text: $serverAddress)
+            serverAddressSection
+            submitButtonSection
+        }
+    }
+
+    var serverAddressSection: some View {
+        Section(header: Text("服务器地址")) {
+            TextField("nofan.xyz", text: $serverAddress)
+        }
+    }
+
+    var submitButtonSection: some View {
+        Section {
+            Button("提交") {
+                instanceAccountViewModel.createInstanceApp(at: serverAddress)
+            }
         }
     }
 }
 
 struct AddAccountView_Previews: PreviewProvider {
     static var previews: some View {
+        // FIXME: priview
+//        Text("Fixme")
         AddAccountView()
     }
 }