custom theme

Hi do you know if there is anything I need to add to my functions.php file to get this working correctly. Currently I have arrows but can’t scroll and I have 6 product images and it’s sowing 4 by default. Also the zoom feature is not working. I would assume they would be something I need to declare.

https://www.ads-software.com/plugins/yith-woocommerce-zoom-magnifier/