Assuming we're dealing with a '94 auto:
Before doing anything with the shifter, I'd recommend removing the upper console and unplugging/unclipping the wires going to the OD switch. They are very fragile and easily broken when removing the shift knob. To actually remove the shift knob, you'll need to pull the "U" shaped retainer out of the front of it (a small pick works well here), then pull the shift knob up.