Utuado,
First, remove power to the range, you'll be dewaling with 240 VAC components, you don't want to hurt yourself.
Open or remove the oven door, and remove the four screws along the bottom of the control panel, they attach the panel to the oven frame.
Grasp the control panel by the end and pivot the panel out at the bottom, until the panel unhinges from underneath the cooktop assembly.
Be carefull and cautious, you don't want to accidentally knock any wires loose or cause any breakage.
Remove the knob, then the two screws holding the switch to the panel.

Thanks and Good Luck,

:) :) :)