01) Access the Control Panel

02) After login click on Configuration >> Network Social

03) In the Google Merchant ID line, click Options >> Edit

How to get Google Merchant ID?
- Sign in: https://merchants.google.com/

How do I enable Google Customer Review?
- Sign in: https://merchants.google.com/
- Click on Merchant Center Programs
- In Customer Reviews click on Enable

04) After completing Google Merchant ID click on the Update button