I believe this should be in the help section of the forums.
You can change your username by going to the homepage and clicking 'user panel', which you will need to log into. Once you've logged in, there's a option to change your username. I hope this answers your question!
As Signur said, this should be in the Help Boards, a mod will move this shortly if so.
But Shurtle has provided a nicely set out tutorial for this sort of thing:
As Sigunr has already said, you need to visit the 'User Panel' and log in, then find the correct field to successfully change your username. This will also change your forum username so people can recognise you clearly and won't get confused.
Below, I've placed a small step-by-step tutorial and highlighted where you need to be looking and/or clicking!
(http://i.imgur.com/5sKlhNT.png)
(http://i.imgur.com/Im1Tkux.png)
(http://i.imgur.com/OD56qW1.png)
If you come across any further issues, be sure to send an email to
[email protected] using the email you've created the account with. Include your old username and the new username you'd like to change it to.
Any other messages sent through, such as "hello c:" or whatnot, will not receive a response.