Use the keys 1 through 5 to make the pen do pre-coded designs. Use the dials to change color, though it will only work on some designs. The color you made will appear in the square. Press 0 to be able to drab where you click, then press 9 to bring the pen up. You can do this as many times as you want before you press 0 again to end that. Press the space bar to clear everything and reset the color.
I liked the original project, you should see it.