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://wisej.com/docs/html/Methods_T_Wisej_Base_ApplicationBase.htm
https://wisej.com/docs/html/T_Wisej_Web_Application.htm
Best,
Luca