You have identified an interesting domain name and want to keep it aside before pre-ordering it, the "Favorite" feature is for you. From any domain name, you can click on the heart icon on its left to save it.
To find all your favorite domain names, go to your account in the "Favorites" section.
To delete them, just click on the heart icon again.
You added a domain name to your favorites and you can't find it? It might be because it is no longer accessible and/or has been recovered by another user.