Some have 3, some have 2. My Gigabyte has 2. There should be small black jumper, kinds short so it might look like its part of the mobo, take tweesers or something small, maybe pliers, and pull the jumper off, then just go one pin down and slide it on the one pin, there wont be another pin to put in the second hole of the jumper, leave there for a few seconds, replace the jumper to where you got it.