The plugin doesn't show?!

Hi, I have just installed the woocommerce plugin, and I love it! Then I installed the WooCommerce Advanced Product Quantities plugin, and I have added the rules and everything, but somehow it doesn’t work? It doesn’t show on the product page. It does show the text, Minimum Qty: 1, but it doesn’t show the box in which the customer can choose the qty of it?! So, I don’t know what I did wrong here. Any help would very much be appreciated. Beforehand Thanks!

By the way, does it work with variable product as well?

You can see my product page here where I try to get this plugin to work: https://buppha.com/product/beautiful-rhinestone-bow-earrings/

I want to make it so it looks like this screenshot: https://www.ads-software.com/plugins/woocommerce-incremental-product-quantities/screenshots/

https://www.ads-software.com/plugins/woocommerce-incremental-product-quantities/