Reset An Email Address

My husband opened an account with draft kings, he has a memory problem and we are having problems. We opened the account on Facebook. And recently Facebook has logged us out. When we tried to log back in we realized he used an incorrect email address. We tried and tried to log in but with no luck. I then made the mistake of trying to create a new account, but that only created more problems. Now every time I try to email you, they respond to the new account that we can't use because of the other active account. We have a balance in the original account, that my husband would like to continue betting with. I guess what I need from you is to fix the email address from..please, please could someone help me?