Looks like you have to send an e-mail to support to do this now. Sigh.
Edit: Due to major infrastructure changes we're implementing in our users' database, we have disabled the ability to modify usernames in the Dashboard the only way to change the username is to delete the account and register again, to delete your account please fill up the form: http://tinyurl.com/WazeDelete
You have got to be kidding me.... I guess I have to make an alternative account to edit the wiki and keep this one for editing. Urg.