[doubt] get firebase login data

hello, I have a doubt about getting the login data on another screen to put in the side menu. data is being stored in firebase through my login screen.
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I would like to add the data in these lines, if possible send me examples in blocks so that I can have a better understanding of the subject.

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Please, can anyone help me ?

after many hours studying and racking my brains, I managed to solve it myself.
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