How to get a Mac to stop saying “can’t connect to iCloud”?

(I apologize if my grammar is incorrect) I’m at one of my family members house. They have a Mac, and they let me on it. I keep getting this pop up “This mac can’t connect to iCloud because of a problem with (iCloud ID). I don’t know what to do. I have a windows, so I know nothing about Mac computers, and I don’t... show more (I apologize if my grammar is incorrect) I’m at one of my family members house. They have a Mac, and they let me on it. I keep getting this pop up “This mac can’t connect to iCloud because of a problem with (iCloud ID). I don’t know what to do. I have a windows, so I know nothing about Mac computers, and I don’t want to sign out because they might get mad.
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