It seems you can only change it if you are a subscriber...

If you are follow the instructions below.

Send a message to FlyOrDie Support (support@flyordie.com) containing your invoice No. (or order ID, account ID). Please also include your original nickname and the new one. 

A nickname can be changed only once. The change is irreversible. 

NOTE: If your nickname contains special characters, please include a link to your player's info page, or use unicode UTF-8 encoding in the email. 

P.S My 100th post:D

Why don't you jst register a new nickname and not use dat 1? Simple ;\

I mean age sry :)

How do u change ur age......rittttttte ;\

On web browser mode when the screen loads up click settings...

once you login you should be able to change it.