It's amazing how many people get the 'username' and 'email address' fields mixed up when they sign up. Maybe we need to improve the form?
Actually may not be, some members do want their username to be their email address. I have even seen url as usernames. Not really surprising.
You can't. You need to have a really, really good reason to do it, and at this stage ( having 3 posts) there is no way you can change your user name.
Forethought solves many problems. You don't have to worry about it too much, if you are like most newcomers, then you will be banned and then you won't have to worry about it anymore. In other words don't forget to lurk a bit and read the rules before you register.
changing a username is not going to happen unless you either have a good reason like most people say or that you can in some way get an admin to change to it...which mostly likely won't lol...but in most cases, you send as it to be deleted so that you can get the correct one you want...i had done that with other one since i didn't know my password and the fact that i think someone hacked it as well.