In Gecko, we support 3 Review App, they are required and free.
1. Display review section below product thumbnail (Eg: The product in Home/Collection page)
Go to Theme settings -> General -> Choose the Review apps -> Enable/Disable “Use Rating Homepage?”
2. Review in Ptroduct Page:
Go to Theme settings -> Product Page -> Enable/Disable “Use Rating product page?”
3. Review in Tab Description in Product Page:
Go to Product Page -> Sections -> Tab Description: