Hey @Lijn-B.
This functionality is not available yet, and the design is probably for visual demo only.
There are some Feature Requests in that regard, like:
- Bookmarks, Wishlists, Favorites for Custom Post Types - Feature Requests - Cwicly
- Woocommerce product wishlist - Feature Requests - Cwicly
There are plenty of options available in the WordPress respository.
Maybe you can also find some inspiration here:
Hope that helps for now.