I haven't used Happ's light-up buttons, but looking at the pictures, there are metal connectors on the sides of the microswitch assembly. The connectors in the back are for connecting the actual button, so the ones on the sides must be for giving power to the lamp; one side will be ground, the other power. You can hook up those connectors to the power connectors within the computer - the molex connectors with 4 wires. Of those 4 wires, the outer two are power (positive): orange is 5v and yellow is 12v, and the middle two wires are ground (negative). Which outer-wire you hook the light up to of course depends on the light voltage (I see Happ has both 6v and 12v LED's).