You can check your registered email address from the app by following the steps below:
1. From the Home/Friends or More tab, tap Settings > Account.
2. Tap Email address > Change your email.
3. Your email address will appear below the email address entry field.
If you are viewing this article on your smartphone, tap here to move to the Account settings screen.
If you haven’t registered an email address, see here.
If you wish to change your email address, see here.