This question doesn't really belong here, but new users aren't allowed to change their usernames when they first join. You either have to wait about 4 months, or you can just make a new account.
Either way, I'm gonna have to close this thread, since it's considered spam. D:
I can't leave this spot that's empty without you
It's an area that no one else can fill
The night's never gonna be the same. SHINee - Area