To use Google Authenticator on your Android device, it must be running Android version 2.1 or later.

Then you have to be sequential when setting up Google 2FA

Step 1 : You Must Download The Aplication

Download and install Google Authenticator App

- Visit Google Play  For Android OS

- Visit Apple Store  For Apple OS

Setting Up Here 

Bitsten 2FA Click Setup

 iTunes Apple OS : 

Android OS :

Step 2 : Scan QR Code

For Scan QR Qode You Must Save BACK UP Code (You Must Save) or Print Back Up Code

Step 3 : Enable Google Authentication

Fill Your Password And 2FA Then click Enable Google Authenticator Then Finish You Got Google 2FA