Just plug in the two ends of the cable into the NGPCs and turn the systems on. Select the link mode at your game?s menu screen, and you?re ready to go.
Having tested the Power Link for two days straight now, it looks like the product can take a lot of wear and tear, but not as much as the official SNK brand cable. Upon removing one end of the cable from my NGPC for the third time, the head of the link partially came out of its translucent casing, but was easily pushed back in. Just be gentle with your cable and everything should be fine.