Hi, ah, Cakes.
I'm currently looking into some old threads we have stored away for how you can change your username.
Also, please refrain from posting over and over that you'd like to change it; I can understand why you want to but we're sort of slightly understaffed.
You can go to the helpdesk, http://www.thedollpalace.com/helpdesk/open.php
, to request a name change. However, given that they've been backlogged for awhile, it may take awhile for your name change to take hold.