It's really simple to do, it took about 10-15 mins from start to finish on my (now sold) Ion.
You need to tack two wires onto the solder on either side of the board where the on/off switch is. From there you need to route those wires down into the frame and insert one wire in the top of the membrane connector, and the other into the middle connector. Job Done.
You could also wire up LEDs like the walkthrough, but I never bothered.