If you click on 'Pending', it'll mark the item as 'Done' and move it to the right list - and vice versa. If you drag and drop an item into the various lists, it'll automatically update the label
At the moment, if you reload the browser you'll lose your to do list - so don't refresh or exit the browser unless you want that to happen! Working on changing this...
You can drag and drop items into the list, both with a mouse and on touchscreen