Why am I getting someone else’s username?? With MY sign in??
Log-in to your Adobe Account Profile page.
That's where your forum screen name is stored.
Note that while your Adobe profile is where you are supposed to update your screen name, those changes are not currently propagating to the new Communities. Adobe is aware of and working on the issue, but they do not have an ETA on a fix.
That's too bad. I was, however, able to delete an avatar that I'd never chosen....