Every admin has an active account which is created automatically when they create a forum...the log in details are the same (username - in this case it should be Flight 33 and password) as they are/were for your root admin account on your board at the time when you created it........is that the account he is having trouble posting with?
Back to this member.........did you save his email address and IP (IPs if he posted on more than one) so he can be reported to his Internet Provider?