Login For an App

Hey so I am trying to create a base app design to showcase. However, when I try to add a firebase data table to have an accessible data table for the program to pull a username and password from, I cannot figure out how to link it. I have changed the settings as suggested, I have my API key, but I cannot find my “Database URL” and stuff like that. Any ideas?

The Database URL is in the Realtime Database under the Data tab.

This might be helpful: Email Sign In by Firebase - Thunkable Docs