Well, I believe the admins and higher can change your name, and it's always for free. Just remember, you can get your name changed every four months if you're a regular member up to a Tier 2 Donator, and if you're a Tier 3 Donator or higher, you can get it changed every three months.
But,
here's a helpful link just in case I missed out on anything. You should probably see if there's anything else about this in the FAQ, too, just in case.
Actually, it's Tier 4+ to get a name change every three months. The name change thread is stickied in this section. If your a normal member, or Tier 3 and below supporter, you can get a change every four months.
And to actually get the change, make sure to count four months from when you joined/got your last change. It must be on the exact date, as well.