By default, the Scripts meta box is enabled only on Pages. If you want to use the setting on other post types (i.e. Posts, Products, etc.), you must add a line of PHP to your functions.php:
// Add support for the Genesis Scripts meta box on a custom post type add_post_type_support( 'download', 'genesis-scripts' );
Here, I added support for the “download” custom post type (Easy Digital Downloads). To add it to some other post type, change the first parameter to the appropriate post type. You can also pass an array of post types if you want to enable the meta box on more than one post type.