Go to http://accounts.google.com/signin/usernamerecovery and enter any email accounts or phone numbers that you've had for a while and which may have been used as recovery info. The “find your email” page can help you locate any forgotten Google accounts.

To get started, head to g.co/recover and enter your Gmail address. If possible, try the following to make recovery easier: Use a computer, phone, or tablet you've previously used to sign into your account. Use the same browser that you usually do, like Chrome or Safari.

To sign in to your Google Account (or any Google product): Go to the sign in page of the product (for Google Accounts it is myaccount.google.com). Enter your Gmail username (everything that appears before '@gmail.com'). Enter your password.