you can change your username on ‘about me’ and then near your avatar there should be an option to change your user id. it's a one-time thing, meaning if you've already changed your user id, then it will be like that.
This is a good option because have to stick to some random alphabets and numbers as a username on a gambling platform or even any other platform can be the first red flag, or should I say turn off to most gamblers.
I believe most gamblers love the feel of personalization, that is, them being able to personalize or customize their profile starting with their usernames.