You can edit the title and description of an app and view its ArcGIS portal item URL.
The URL section only appears if the app has been saved at least once. The URL cannot be modified.
To edit app info:
While editing your app in Designer, in the taskbar, click Info.
In the Title box, type a new name for your app.
When you change the title of your app, the title of the corresponding ArcGIS portal item is also changed but only for the Development stage. To change the title of other stages, you must deploy the other stages again.
In the Description box, type a new description for your app. This description appears in the ArcGIS portal item for the app.
Click File | Save.