Kindly follow the steps below:

1. Visit the reCaptcha page of Google here:
2. Click on the GetReCaptcha button.

3. If you are logged in to your Google account, it will not ask for login details. If it does, then please log in. It will then take you to the following page 

4. Delete the old keys if you have of your DOMAIN, otherwise you might get an error

ERROR: Global site keys are not supported

5. Enter your domain name and all the details it requires.

6. It will generate a new Site key and Secret Key.

7. Add those details to your Viral Loop site