If you have an older theme that doesn’t support app blocks you can manually place our app in your product template with code.
- Go to the Shopify Dashboard
- Under Sales Channels click on Online Store
- Click on Themes
On the theme, you want to edit click on Actions > Edit Code
Go to your product.liquid template and then into the child templates until you find where the product options are.
Add the code below to this location. You may also need to hide the old product options to prevent duplicate options.