You can add more sticky notes by first editing the scripts from the script in the head tag to apply to the added sticky notes. You should find two lines from the step 01 code that look like the ones below. Just duplicate them and change the number 1 to 2. It should look like:
$( "#stickynote1" ).draggable({ handle: "div.dragstickynote1" });
$(".closestickynote1").click(function(){$("#stickynote1").fadeOut();});
$( "#stickynote2" ).draggable({ handle: "div.dragstickynote2" });
$(".closestickynote2").click(function(){$("#stickynote2").fadeOut();});