There is no option to change username in this forum. As mention by the reply above it is not possible to change username and the best way is to create alternative account. -snip-
Exclusive members can change their names automatically.
-snip- Now only moderators, Donators, and VIP members can change their names automatically. -snip-
-snip- More than a day has passed, but I have not received any response. -snip-
There is still a chance for you to change your display name/username if you can provide a good reason and meet the following requirements:
-snip- Other members should contact me. I'll probably ignore your request if you have less than 50 posts (unless your posts are very good).
Each user has a display name, which is the only name ordinary users see, and a username, which is what you use to log-in with. Almost always, they are the same.
If I change a name for reasons of appearance, then I only change the display name. The username remains reserved, the user can still login using the username, PMs can still be sent to that username, "search member" allows searching for the old username, etc.
If I change a name for reasons of privacy, then I change both the username and the display name. In this case, it is possibly hazardous to reserve the old username, since it allows someone to test for the existence of that username, possibly defeating the privacy benefit. If you're worried about being impersonated, then simply don't seek to have your username changed.