Online Users Trouble

I want to make a space where a user can click on a button and their username would appear in a spot titled ¨Online Users¨. I have a repeating group with that cell users name, but not much else. Can someone give me step-by-step instructions on how to do this?? Been at this all day, have even tried watching videos but they either don´t show the same thing or are too confusing.
Please help.

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