With Online Store 2.0 themes, you are able to install Appstle widgets using app blocks in your Shopify theme's customization settings, including a review widget.

Step 1: In your Shopify Admin, navigate to Sales Channels > Online Store > Customize for your currently active theme.

Step 2: Click on the App Embeds section, enable Appstle Reviews, and save.

Step 3: Navigate to Products > Default Product using the dropdown in the center of the page.

Step 4: Click Add Block > Apps in the section(s) you want the review widget to appear, then click on the Appstle Review block options Review Carousel and Review Widget.

Note: As the customization panel is set up as a drag and drop editor, feel free to do so if you wish to place it somewhere else on the page.