I need help on wiring my REAR fogs using a Mazda Protege fog light switch. How do I wire them to the relay and battery to make them light up? do I need a scotch lock too?

The 21 watt bulb holder has 2 wires. What is it used for? Is one for positive and one for negative? The Mazda Protege switch has 4 wires also. Where to I tap them? I layed 2 wires already from the REAR fog all the way to where the dimmer switch is. All I need is on how to make it light up with the switch HELP!!!!!!