If you're using one of the 10 Horizon themes (Tinker, Ritual, Fabric, Pitch, Dwell, Savor, Horizon, Heritage, Atelier, Vessel), you can easily add the Star Rating Badge as a block on your collection pages.
Install Star Rating Badge on collection pages
Step 1: Enable app embed
To enable Judge.me app embed:
From your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit and click Customize.
Click the App embeds icon (third icon on the left menu).
Enable Judge.me app embed.
Click Save.
Step 2: Add the Star Rating Badge code
For the Star Rating Badge to show on your collection pages:
Go to your Shopify theme editor:
From your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit and click Customize.
Find the collection template:
At the top of the Shopify theme editor, click the Home page dropdown menu in the middle.
Select Collections then select Default collection.
Add the Custom Liquid block:
On the left sidebar, inside Template, click the right arrow icon (>) next to Collection to expand it.
Hover under Price and click the plus icon (+).
From the block list, select Custom Liquid.
Add the code for the Star Rating Badge:
Click the Custom Liquid code you just added to open it.
In the Liquid code field, paste in the following code:
<!-- Start of Judge.me code -->
<div class='jdgm-widget jdgm-preview-badge'>
{{ closest.product.metafields.judgeme.badge }}
</div>
<!-- End of Judge.me code -->
Click Save.