How register a user in the App

Hello. I don't understand how complete the registration of a user to Starling App.

I configured Password Manager to work with Starling2FA and it works properly.

I'm interested to give to the user the possibility to use the App for authorization, but I don't know where to find the QRcode required by app during the user registration?

Where I can find it?

Is it the the same for all users?

Does It change in time?