Right now you are restricted to entering an item at the top of the list when you hit the + sign. When you add a new item, then add your next item is added directly below the previous item. You should be able to select an item, it should highlight the text to show it is selected. Then hitting the + sign should add a new item below the selected item. Additional functionality would allow to to add a new item above the selected item. This is a work around until items inside lists can re rearranged by dragging.