Note: We highly recommend creating a child theme when you are editing theme template files. You can learn about creating a child theme in here.
You might notice that your products in the shop pages created with the shop module don't have a "Add to Cart" button, if you want to add that, all you need is to add this code in the functions.php file of the child theme:
// Add "Add to Cart" buttons in Divi shop pages
add_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 20 );