There is no chance that you will change your username instead you will ask the moderators to help you out but there is no assurance that they will help you immediately.
No, you won't get any answer if you pm any mdoerators, since it's not a way to contact theymos to change your username.
Done. Now only moderators, Donators, and VIP members can change their names automatically. Other members should contact me. I'll probably ignore your request if you have less than 50 posts (unless your posts are very good).
You must pm to theymos by yourself.
Actually what's the problem create new account as OP just still newbie? If OP afraid someone will spam or hack his email, he shouldn't create this thread earlier. But since it's too late, i hope OP strenghten his email password and don't click any suspicous link from any random email he received later.