Just your email and password, that’s really all it is. No username to remember or anything complicated like that. I had the same confusion at first because some sites do it differently. The easiest thing I did was save my credentials in my phone’s password manager – now it fills in automatically. I pulled up the uk luck casino login page on my browser and saved it straight from there, whole thing took about ten seconds after that. If you’re on iPhone the Face ID autofill makes it even quicker. Also worth keeping your email handy in case you ever need to reset – the reset process is fast too, came through in under a minute for me. Once it’s saved you really never think about it again