I have forgot the username and password, how to reset for all even though I enter the back up email

  • go to forget password,option. ..... verify your mobile number and get password. ...... Jul 1 '15 at 13:53

From Google Help page Recover your username and password:

If you ever forget your sign-in information, you can go to Google's password assistance page for help.

As you don't remember your username, first select the second option I don't know my username and click on continue and follow the instructions.

Once you know the username you can recover your password by selecting the first option I don't know my password.

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