Thread: Shift knob removal.

If you look on the front side of the shifter, just above the base of it you will see a little slot. In that slot is a clip you'll have to pry out with a flat blade screw driver. Once that is out the shift knob should pull right off.

If you have performance shift, there may be a connector in there you have to work around too and be careful of.

Here's a good writeup with pictures:
Grand Prix Net: Installing a Shift Knob or Shift Boot

The writeup is for replacing the shifter boot, so just ignore the steps that don't apply to what you're doing.