Hello, I'm Karizaki now

[DareDevil42]

Hi there and welcome back, glad to have you here. I noticed your issue with the username and I'd like to try and help you with that. Now I cannot guarantee that it will 100% work since I did it, but it might've been because of my forum rights. Nonetheless I would still encourage you to try it.
On the top left corner click on "Edit profile", after that in the list on your left pick "Change username". It will require you to insert the password and you can then change your username.
Hope this helped. Good luck and see you online!

I've looked all through the Editing options, I am able to change avatar, password, signature and all that but there is no option to change my username.