If you're just doing stereo sound, then you need two pairs of speaker cable. One run to go from the receiver to the subwoofer, and another to go from the subwoofer to each of the speakers.
Here's a pic of your sub:
The receiver to sub run goes to the "Speakers In" terminals, and the sub to speakers runs go from the "Speakers Out" terminals. You also need to set your crossover frequency appropriately, to 100Hz or whatever the manufacturer recommends.