allasai on "[Plugin: WooCommerce - excelling eCommerce] Checkout button not showing on Woo commerce product"

Please help! I need to know how to upload the add-to-cart-variation.js and where to insert the following code:

function mv_my_theme_scripts()
{
wp_enqueue_script('add-to-cart-variation', get_template_directory_uri() . '/js/add-to-cart-variation.js',array('jquery'),'1.0',true);
}
add_action('wp_enqueue_scripts','mv_my_theme_scripts');
?>