To open another form?
Or to go to a different page?
To open another form you can simply create it and show it.
To go to a different page: Application.MainPage = {page};
To navigate to any URL: Application.Navigate. To download a file: Application.Download. You can find preliminary docs about the Application class here:
https://docs.wisej.com/api/wisej.web/general/application?q=application
Best,
Luca