If you google it, there's some info on it! I think the second link when you google, had pictures. Looks like you do it up similar to a disposable. It still needs a cover to go over the top. And it looks like it's a one size fits all nappy, so it might grow with your baby.
If that hasn't helped, maybe pop into the Cloth Nappy thread and see if anyone there's ever used a Zappy