You can't change your username. But if you let me know what you want it changed to, I can sort that out for you.

Just a note - if you log out, once I've made the change you will have to log in using the new username, not the old one. However, if you've ticked the remember me box when you logged in and don't log out (basically just close the tab or window until you return), this won't be an issue.