I really wanna change it. But I don't know how.

On your preferences page there is a link to change your UN. It costs 1000CSC though. Another option would be using a Loyalty Box Totem which grants you a free UN change.

link c:

https://subeta.net/preferences.php?act=changename

It costs 1000CSC to change your username.

Okay, thanks guys. :)

for 1000 csc on the account dashboard page or with a loyalty box as you can see i am in dire need of a username change too, i get my loyalty box tomorrow probably so i should go hunting for an username

oops not fast enough