You can recover the email address connected to your account by clicking Recover Account below the login screen.
Note: To recover a contributor's email address, the site owner can log in and check the email listed in the contributor's profiles.
Click Don't know the email address.
Enter your custom domain or built-in Squarespace domain, then click Send recovery email. Check your email accounts to see which received the recovery email.
Note: If you can't find the recovery email, check the spam/junk folder for all your email accounts. If you're still unable to locate this email, or access the email account, open a ticket.