Whahaha, guys... don't bother
On my forum (not kidding) it's not allowed to change user names without requesting.
And these are requests like "Change Louistje to Louis" (Louistje is diminutive for Louis) or change "Ritsjie Recordings" into "Ritsjie", because the recording stuff didn't happen. Or change "Alexanderverbeek" into "Alexander", because verbeek looked stupid
.