Reply To: This is my site and How can I add quantity of that product in show page.

Hello,

Thank you so much for contacting our support center.

Try to add the following code snippet to the Custom CSS area in Theme Settings to show quantity for variable products

body .quick-shop-wrapper .woocommerce-variation-add-to-cart {
    -webkit-box-orient: vertical;
    -webkit-box-direction: reverse;
    -ms-flex-direction: column-reverse;
     flex-direction: column-reverse;
}
body .quick-shop-wrapper .quantity {
    display: block !important;
    margin-bottom: 15px;
}

Regards