http://vww6ybaluuo4gfuuf6zvlt23hvg2pcfayco5iiwhv3plo6o7bewivoid.onion/ca/lists/list-admin/faq
Click on the “admin” link for the list that you want to delete on the left side of the screen click on “remove list.” The list won’t actually be deleted immediately, but it will no longer be viewable and the whole list will be deleted after some time.