The first thing you will need to do, is follow these directions:
https://bitcointalk.org/index.php?topic=497545.0If you need help with signing a message read this:
https://bitcointalk.org/index.php?topic=990345.0While you are at it, take sometime and go back through the threads that you've posted on with that
account, and find a posted "address". They will need that proof to verify ownership of the account.
When you do sign your message do not forget the current date.
I am not a mod, I'm just helping out. You can post the signed message here, and I can verify it for you.
Hopefully a Mod can get the account locked until this gets fixed.
Goodluck!!!