Actually, it can be edited if the admin does it for you.
Username can be changed by
- Yourself if you are the VIP member with 50 BTC donated to the forum. You can do it by yourself.
- Admin if
- You have solid reasons to change it
- You are doxed and want to change your username. There was a case with account username contains his real name. A request topic was approved shortly within a few hours.