It's possible to change your username? I thought you weren't allowed to so you can stay accountable for what you say on here.
Ah, thanks.The forum software does not let you change your user name.If you mistyped your user name while registering, typed a user name longer than 25 characters that was then truncated, or mistakenly tried ...macrumors.zendesk.com
Here is a FAQ that should answer your questions.
tl;dr You can request a username change. (But read the FAQ first)