Wait, just re-read this and realize you are running Classic. I think you'll want to delete this user account via FTP.
Someone who remembers more about Classic can probably help you more.
Cool to you see you running a Classic board ... and in my neck of the woods (here's my site ctfisherman.com).
You won't regret the move to Threads. Your users may complain about the different style at first, but they'll love all the new features.
Good luck with the move.
