Calling data from Firebase

Good eveing. I am new with AppInventor and I want to create an app where users register different data (Username, ID, date, etc) and its later shown on a different screen.
For this I am using Firebase. There is no problem with the registration process, but I don't know how to make the data appear.

These are the screen and part of the database I am talking about. The user has already entered all the data and when he or she enters this screen, the data must be seen on the labels at the right. In the database there are multiple users, each with a particular set of data associated.

I'll be really pleased to hear some suggestions or help about it. Thank you.

Can you show your blocks about registration process ?

Hello Adrian

See TimAI2's website for his guides on Firebase:

This example should be enough to get you going: