Change Apple Arcade sign-on
We have Apple Arcade as part of our family plan. I installed Sp!ng on my wife's iMac, as my computer is too old to have Big Sur, and that game needs Big Sur. But I noticed that it signed in as HBRAZEE, which has to be me, not her. I Googled changing the name, and I found matches for iPhone and iPad. I suspect the sign-on name would be useful to continue games on her iPad or iPhone after starting on her iMac. Is my suspicion correct?
How do I change her iMac's Apple Arcade signon?
(I had to set the device in this forum to my Mojave Mac instead of my Catalina Mac or my wife's Big Sur Mac because I don't know how to change it).
iMac 27″, macOS 10.14