When you see a property that you would like to add to your wishlist you can click on the heart icon. If you are not logged in you will be asked to log in. If you don't have any wish lists you will be asked to 'Name your Wishlist'. If you do have one or more wishlists you can select which one you’d like to add it to.  

To view your wishlists, click on Account in the dropdown menu.

This will take you to your account where you can select My Wishlist which will bring up all your lists and properties you have saved.  Here you can also create a new list.