One of the Forum Administrators should be able to help you with that. I think you could use the "Contact Us" link at the bottom of any Forum page since you probably haven;t been set up for PMs.
My Computer
At a glance
Win 7 Pro 64-bitIntel i5 2.4 Ghz8GB DDR3Intel HD 3000
Use this Contact Uslink to request the change. Ask them if you can have different login and display names (I think they are linked). Tell them your new name request, if it's available, it should not be a problem.
Bill
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My Computer
At a glance
x64 (6.3.9600) Win8.1 Pro & soon dual boot x6...AMD A6-3420M APU with Radeon(tm) HD Graphics6.00 GBAMD Radeon(TM) HD 6520G
Which admin did you contact ? .... if he's not about it could take a while, but even the ones that are online are very busy so you might have to wait a bit, but they will get back to you