Go to Products on your BigCommerce dashboard. In list view, you’ll see a star on the far right of each product.
Simply click the star next to the product you’d like to feature on the homepage of your site, and the star will turn blue to indicate the change was made. Featured products will show up immediately on your homepage after a refresh (no “Save” needed).
If the number of featured product you’ve chosen to show in the theme customizer is less than the number of products you’ve marked as featured, your homepage will rotate through your featured products, showing new ones on each new visit.