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.

If you've forgotten your Google Account password, you can try to recover it through the Google website. On your phone or computer web browser, go to www.google.com/accounts/recovery. Follow the instructions on the screen to reset your password.

Go to your Google Account's third-party connections page. Select Linked account. Select the third-party app or service whose connection you want to delete. Tip: If you have more than one connection type with that app or service, this connection appears under “Google has some access to your {App name} Account.”

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.