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. On the next page, you'll be asked for your name.

Once you've opened the web address of your email provider, you will see a login page. Enter your email account's credentials (username and password) in the text fields provided. If you forgot your password, you can usually click the "Forgot Password?" link to reset it.

On your computer, go to gmail.com. Enter your Google Account email address or phone number and password.

On your computer, sign in to Google. On the top right, select your profile image or initial. On the menu, choose Add account. Follow the instructions to sign in to the account you want to use.