The following are steps to register OTP using google authenticator
STEP 1: Downloading google authenticator
Visit Google Playstore
Download and install the application
STEP 2: Setting up the application
On your mobile device, open the Google Authenticator application.
If this is the first time you have used Authenticator, select Begin setup. If you are adding a new account, choose Set up account from the app's menu.
STEP 3: To link your mobile device to your account:
Confirm that date and time on your device is correct.
Using QR code: Select Scan a barcode. If the Authenticator app cannot locate a barcode scanner app on your mobile device, you might be prompted to download and install one. If you want to install a barcode scanner app so you can complete the setup process, select Install, then go through the installation process. Once the app is installed, reopen Google Authenticator, then point your camera at the QR code on your computer screen.
STEP 4: Testing the application
To test that the application is working, enter the verification code on your mobile device into the box on your computer next to Code, then click "Verify."
If your code is correct, you will see a confirmation message. Click "Save" to continue the setup process. If your code is incorrect, try generating a new verification code on your mobile device, then entering it on your computer.