How come there is no option in the User CP to change one's username? I would really like to.
If you want to change your nickname, contact one of the Senior Admins. They can do it for you if you ask nicely Seriously, send me a PM or post a reply with your desired nick and I'll change it for you.
Do I have to have letters in my name or can it be all numbers? Also, can I use a colon ":"?
As far as I know you can use any character, not 100% sure though.
Your username has been changed to 100:10100. Remember that you now also have to log-in with that username!