Little heads up on what they do, basically they kill the sound at a press of a button, Commonly heard on RATM tracks in standard E 400 tuning, in which Tom Morello's guitar for this tuning has a 3 way Toggle switch with 2 active pickups, which he uses as a toggle switch by turning one of the two volume pots, to zero and one to ten. Of course with a strat or tele, this cannot be achieved without modification. However, I am hoping to show an easy, understandable way, to still aquire a killswitch, without a Les Paul :P.
Step 1: Picking out a switch
Button switch's (Non Locking is FAR better than locking) you cannot do anything really with the locking type I would imagine.
For a toggle switch, if you have a toggle switch with 6 prongs on it, You would follow this guide as normal, and leave the middle prong for a "ON/OFF/ON" effect, if it is a 3 WAY switch.
if you have a two way toggle switch (like me), you will want to solder wires onto the middle and the side the oppisite end, of where you want your switch to turn off. So it will be an "ON/OFF" switch
It is hard to explail so hopfully, you should get it now after seeing the crappy picture I produced.
And now the pic of toggleswitches: