Last step: Check, if the App is available
Open Tools -> WEB Server (or reopen it)

Click on WEB Application, login

With the Login the front end has access to 
- all web apps from terminal20 (related to definition in Access Groups)
- ODATA
- Rest Services defined in terminal20
- Rest Services without own login process
Now you can see your own app

If you click on it, you see an empty Page