How do I put an email to log into in my account?

I originally logged in with Apple ID and am now trying to get it on to my computer during school, the only problem is I need my phone to log in. Does anyone know if there is a way to add an email? (I made the account long before I played on it so if it makes you give an email anyway I wouldn’t know.)
I think you'll need both an e-mail an password assigned and to do that you'll need to contact support. https://support.chess.com/article/346-contact-us
I originally logged in with Apple ID and am now trying to get it on to my computer during school, the only problem is I need my phone to log in. Does anyone know if there is a way to add an email? (I made the account long before I played on it so if it makes you give an email anyway I wouldn’t know.)