So the bottom line is, OP, if you're even thinking about asking Theymos to let you change your username as a Newbie, forget about it. If it's something you really want to do, just create another account and start fresh.
Not even thinking about it, username is not really that important for me, I just wondered on how they do it, because I couldn't find settings for editing the username, and wondered why others already changed their usernames. That's what I'm thinking lately... but thanks for all the informative replies I've figured it out ..
Additionaly, creating a new account would cost me a payment for IP address am I right ? So why would I do that if I already have an account that could access me free here. Also nothing would change my account is still a newbie. Creating a new one would just waste my time