From your supported handheld device, browse the available wireless networks. Look for (and connect to) the one named kBand.
Once you are connected to the kBand network, open your favorite browser and simply go to the address: http://k.band
(Notice the '.' between the 'k' and 'band' here)
And... that's it! From that local site, you can do anything you could do on the live site. You can make requests to sing at the current gig, or you can leave comments on performances (or the gig itself). You can even request new songs to be added to the list (although they probably will not be added until a later date).