'adding' a '3rd' electrical wall switch

Want to "know" how to add a "3rd" electrical wall switch to 2 existing wall switches? "Adding" an electrical wall switch is easy.....when you "know" how. In order to add a 3rd electrical wall switch, you must first remove the 2 existing wall switches......why? Watch "joe" so you can "know" why.

electrical light switch,electrical fan switch,installing a wall switch,videojoeknows,instructional video content,instructional videos,