Go to your profile page and click the “Create New List” button at the top of the page (in apps, it’s the “+” in the top menu next to the “My Wishes” section).
You can create themed wishlists, such as “Birthday” or “New Year’s”. In the main “My Wishes” section, you will see all created wishes, regardless of whether they are in lists or not.
A single wish can be added to multiple lists at the same time.