1. When you are on a selected ad, you can press the plus sign (+) to add that ad to a list.
2. If you do not have any lists before, press the plus sign (+) to the right on the "list page" to create a new list.
3. You can share and edit your list by tapping the three dots in the upper right when you are on a selected list.
4. If you want to find your list quickly, you can tap the list icon in your profile.