Follow these steps to change your registered XAT name:
Login to your XAT account:
Scroll down, click "More":
You will first have to complete the, "Are You A Human?" test.
Finally, you can change your registered name! (It will not work if you put an inappropriate word or the word, "xat")
It must be also be 10-18 characters, a-z, A-Z, 0-9.
Note: You can only change your username every 14 days.