Remove the finial -- the piece that secures the shade to the lamp -- from the top of the lamp shade by screwing it off in a counterclockwise direction.
Lift the lamp shade straight up and place it aside.
Unscrew the light bulb from the socket and place it aside.
Thread the touch-control switch into the light bulb socket on the lamp.
Tighten the thumb screw on side of the touch-control switch to secure the switch into the socket. Skip this step if the touch-control you are using does not have a thumb screw.
Screw the light bulb into the socket at the top of the touch control switch.
Replace the lampshade and the finial.
Operate the lamp by touching a metal part of the lamp to turn it on. Touch the lamp again to brighten the bulb. Touch the lamp again to turn it off.