Fight. What should I do if I forget my online account?

What do you remember? If you have a registered mobile phone, when you log in to the official website of Battle.net, click the link that you can't log in. Finally, there is an option of "I don't know the name of Battle.net's account". Click it to let you fill in your mobile phone number. If you don't even have a mobile phone, you can try to log in to a common email address (if you don't have a password, you can click Unable to log in and choose Forgot Password to try your account slowly. If this email address is not a Battle.net account, you will be prompted that you do not have this account. It's easy to retrieve the password in the future.