Most likely they will send you an SD card looking thing with a tiny white one inserted into it. The tiny white one goes into a slot on the top of the beagle board.
Turn game off. Remove the backglass assembly. Stick the tiny white SD thing in. Turn game on. Watch the screen. It installs itself. The screen tells you when it's done. Turn game off. Remove the tiny white thing. Turn game on. You are good to go.
LTG : )