Hello Sandra,
Sorry for the late reply.
You can achieve this by editing ..\asset\img\add_to_wishlist.png image and uploading it somewhere into WordPress. Then override the default icons with your own using the next rule placed in a style.css of your child-theme or into “Custom Styles” section in plugin settings:
.tinv-wishlist .tinvwl_add_to_wishlist_button.tinvwl-icon-heart-plus::before, .tinv-wishlist .tinvwl_add_to_wishlist_button.tinvwl-icon-heart::before, .woocommerce ul.products li.product a.button.tinvwl-icon-heart-plus.tinvwl_add_to_wishlist_button::before, .woocommerce ul.products li.product a.button.tinvwl-icon-heart.tinvwl_add_to_wishlist_button::before, .woocommerce-page ul.products li.product a.button.tinvwl-icon-heart-plus.tinvwl_add_to_wishlist_button::before, .woocommerce-page ul.products li.product a.button.tinvwl-icon-heart.tinvwl_add_to_wishlist_button::before, a.wishlist_products_counter.top_wishlist-heart-plus::before, a.wishlist_products_counter.top_wishlist-heart::before {
background-image: url(../img/add_to_wishlist.png);
}
*The URL you should apply exactly where your image is placed.
If you have any problems please, do not hesitate to contact us via live chat, so our staff will be able to assist: https://templateinvaders.com/help/
Cheers