You can use these templates to enable adding/removing/displaying wishlist:
@BitBagSyliusWishlistPlugin/Common/_addToWishlist.html.twig@BitBagSyliusWishlistPlugin/Common/_removeFromWishlist.html.twig@BitBagSyliusWishlistPlugin/Common/widget.html.twig
For an example on how to do that, take a look at these source files.