Power to the switch. Pow er from the lights. First of all we should connect the ground wires to the box. If the light switch has a ground screw on it usually green and at the bottom of the switch , connect it now. Second twist the two white wires together and screw on a wire nut. It is usually a good idea to put some black electrical tape around the nut to make sure it doesn't come off. These wires hold the power.