How to add FlutterFlow GitHub app to a GitHub repository?

I'm trying to add a GitHub repository but the doc is misleading/incomplete.

I've created my GitHub repository, but how do I add the FlutterFlow GitHub App there?
There is no link in the doc as to where to go, and the "go back to the Settings and Integrations page and move to Step 2" is confusing, there are no such things, it feels like this was copy/pasted from a different workflow and not updated.