You have not selected any releases yet. If you submitted a list previously as a registered AP user, you can restore it using the tab "Load Previous List" above. But you can also go to the Users tab and import any list from there as a starting point, including your own list.
To pick up a draggable item, press the space bar.
While dragging, use the arrow keys to move the item.
Press space again to drop the item in its new position, or press escape to cancel.