After selecting an item to Add to List, click on Create New List.
Enter a name for the new list under the List field and add a Description, if necessary. You may also choose to keep your list Private (by default) or Public for other users to view.
Click on Save.
Your created List is now selected. Your title will be saved under this List group. Click on Save.
You can create additional lists by clicking on the Create New List link next to the Choose List option.