I registered at your casino, and with the username and password filled in automatically when clicking the registration button, this could be easier for registrants, only need to change the password as desired, because using the password provided is certainly not safe.
The system-given password can be changed but how about your default username, is it possible for changing?
Additionally, were you informed that username is only allowed to chance one time after registration?
Or is it alowed to change multiple times?
Most platform only allow username change for one time, to change from a random username to your chosen username.