Sassy, I agree with Geri, you should go back to the shop and see about getting some better instructions. If that is not an option there are several different video's on this ruler and while some are more of a "sales pitch" there are a couple that might help. I didn't watch all of it but you might check this one, it seems promising, but let us know.
https://www.youtube.com/watch?v=WStMbQJvjdw