On the Shopify App Store
Step 1: Install the Stamped.io Reviews app from the Shopify app store by clicking on the “Add app” button and fill in your store domain if needed.
Step 2: Hit “Install app” after reviewing the permissions.
After that, you will see the Stamped.io Product Reviews under the Apps section of your Shopify admin.
In the GemPages Editor
Step 2: After that, access the Library on the left side of the top bar.
Step 3: Under the Element tab, search for Stamped.io Product Reviews.
Step 4: Click on the Stamped.io Product Reviews element, then hit “Add element’’.
After that, exit the Library and you will find the newly added Stamped.io Product Reviews element on your left sidebar, under the Third Party section.
Check out this article to configure the app and add Stamped.io Product Reviews to your page.