You can move and reorder items on your list very easily, by hovering your mouse to the left of an item until the drag button appears.
Use this to drag and drop an item anywhere you wish:-
Alternatively, if you have a long list that makes this more difficult, you can:-
This will open up a window where you can select the list and section to which you wish to move or copy the item.
You can move the sections on your list in the same way:-