With 2-Step Verification (also known as two-factor authentication), you add an extra layer of security to your account in case your password is stolen. After you set up 2-Step Verification, you’ll sign in to your account in two steps using:
Something you know, like your password
Something you have, like your phone
Open your Google Account.
In the navigation panel, select Security.
Under “Signing in to Google,” select 2-Step Verification Get started.
Follow the on-screen steps.
Your account, username@gmail.com, is associated with your work or school. If you can’t set up 2-Step Verification, contact your administrator.
After you turn on 2-Step Verification, you’ll need to complete a second step to verify it’s you when you sign in. To help protect your account, Google will request that you complete a specific second step.
If you don't want to provide a second verification step each time you sign in on your computer or phone, check the box next to "Don't ask again on this computer.
Important: Only check this box on devices you regularly use and don't share with anyone else.