Header (among the icons), product cards, product page, featured product, featured collection, rich text, and footer
In the theme editor, click Add block in one of these places and choose the app's block
Apps that work across the whole store (app embeds) are turned on under App embeds in the theme editor
Wishlists
Add the app's header block to the Header section to place a heart next to the search and cart icons
If the app has a product card block, you can add a button to cards too. Each card passes its product to the block automatically
Reviews
The rating blocks on product cards and product pages read Shopify's standard review metafields (reviews.rating and reviews.rating_count). If your review app writes these metafields, stars appear without extra code
If your app doesn't write them, add the app's own block to product cards or the product page