after you´ve set the flash to wireless&slave as seen above, you choose your channel using select (i usually leave it to "1").
then you mount the flash onto the hotshoe, go to flash-modes, choose wireless. then "channel 1" should appear on your screen, camera and flash are now synchronized. remove the flash from the hotshoe (do not turn it off!). the AF-light should be blinking now.
then mount the flash on a tripod or whatever. pop up your on-camera flash, and there you go.
attention: it doesnt work very well in daylight.
(one example here, i just had my first tries with this as well:
IMGP0286 | Flickr - Photo Sharing!)