In order for Jemplode to work on your player, you need to have it running version 2.0 Beta 11 of the player firmware. At the current time, the easiest way for you to do this would probably be finding a friend with a PC and a 'net connection. I think it's possible for mac users to get a serial upgrade to work if the phase of the moon is correct, you click your heels together three times, and you sacrifice a fatted calf, but the friend-with-a-PC thing is probably quicker.

Instructions for upgrading your player firmware with a PC are here.