Step 1. Log in your Gmail account and expand the Settings menu by clicking on it, which is on the right side of the window and then click on Account settings. You can land directly to the Account setting page by clicking this google settings link provided that you are already signed in with your Google account credentials.
Step 2. Now you can see a personal setting box in which you will find Using 2-step verification. Click on this option.
Step 3. A confirmation page appears. You have to click on Set up 2-step verification from the bottom-left side. This process generates a unique code which gives you the additional security with the privilege of accessing your Google account only to you.
Don't Miss : Two Step Verification of Gmail
Step 4. After clicking on the button as stated above, a new page will open asking about your phone information which one you are using. You will receive the code on this phone. If you are using Android then select Android.
Step 5. After selecting the phone, you have to install Google Authenticator from Android Market. Download and install it.
Step 6. Configure Google Authenticator and there are two options present there.
First application on Google Authenticator is to use your smart phone for scanning the QR code that is displayed on the screen. Now click on scan account barcode of Google Authenticator application of your phone (Android or anything else).
If you are not able to see the code, it is better to configure account manually by clicking on Manually add Account. After selecting it, you’ll have to enter the email address with your secret key (received on the phone model you use).
Step 7. Now click on Time based and then click on Save.
You will receive your account verification code in the Android phone at Google Authenticator Application. Write down the number in a notebook and click on Next.
Now enter the code and click on Verify. After your code is verified and you are done with the device configuration, click on Next.
Don't Miss : Setup of two step verification for Gmail
Step 8. You’ve completely configured your phone. If you are going to log in and the phone is currently not with you then what does happen that you cant be able to log-in. For this problem, there is a backup option in order to receive the verification codes. Again click on Next to set up the backup options.
The first option of this backup page is Printable backup codes. You can print these codes and take it along with you any time.
Second option is to add a mobile or land-line number. If you have added a mobile number, you will receive the code through SMS and in case of land line number, you will receive it via voice message.
Step 9. When all the processes are completed, click on Turn on 2-step verification.
From right now when you log-in to your account, you’ll have to give the password with the unique verification code. The code will be changed after every log-in and you will receive it on Google Authenticator in your Android phone.
For more Information Visit Official Page : https://support.google.com/accounts/answer/185839?hl=en