I changed the forum settings and you should be able to change the name by yourself.
To change your username:
1. Click on the 'User Control Panel' link (top right-hand side: http://www.alltrac.net/phpBB2/ucp.php) 2. Click on 'Profile' on the left hand side menu 3. Click on 'Edit account settings' 4. Change the username, enter password, click Submit
I tested the above with a test account. Let me know if you have any problems.