Sign in with your email address and password.
Click Sign in another way when prompted to enter your two-step authentication code.
Click Use your backup code and enter your password and backup code to disable two-step authentication. (The backup code was shown to you when you set up two-step authentication or if you regenerated a new one.)
Submit a request through the account recovery form. For security purposes, you will be asked to provide detailed information to confirm your identity, and the process will take 1-3 business days.