If you would like to use your email address for 2-step verification follow these steps.
Click "Security" from the drop-down menu.
Click on "2-Step Verification".
Click on "Email".
Enter the email address you would like to use and click "Next" button.
You will receive an email message similar to the one above.
Enter the code from your email message and click "Next" button.
Email address has been successfully added. Click "Done" to go back to 2-Step Verification configuration.