If you want to remove the lock cylinder part there is a pin that points downward under the lock cylinder. remove the ground cable (-) from the battery. Put the key in the ignition switch and push up on the pin. if you feel the pin move up pull out the tumbler out. If you don't feel the pin move up turn the ignition switch to another position and see if it moves up there.
for the actual electrical part of the ignition, you have to take the lower cover off the steering column around the key. then Use a number 10 torx to remove the screw that holds the ignition switch to the column. Press the plastic lock tabs and remove the switch.