YITH WooCommerce Wishlist is a plugin that allows your customers to arrange the products they are interested in into one or more wishlists. This process allows them to check these products back again at a later moment and eventually proceed to purchase them.
Thanks to the integration with YITH WooCommerce Product Slider Carousel, the admin will be able to choose whether the wishlist button will be shown on the slider or not.
After installing and activating both plugins, you will find the option to enable the wishlist button directly in the slider settings in YITH > Product Slider Carousel > Product Slider Carousel (tab) > Add new Product Slider Carousel > Content settings > Show Wishlist button.
Now your users will be able to add the products in the slider to their wishlists.
For further details about YITH WooCommerce Wishlist settings, please refer to the official documentation.