Put a small screw driver under each side of the button. Do not use the front and rear, use the sides. There is a flat metal spring under the push button that holds the button still on the shaft of the shifter. In the bottom of the knob after you remove the button you will see a small outside snap ring that sets in a grove on the shift lever itself, it sets snug against the bottom of the knob. You will need a set of small external snap ring pliers to remove it.
Okay Pete, I got the button out of the knob, removed the snap ring and one other ring that was in there but the knob still won't come off!!!! I can't see anything else that would hold it on the shaft.
Everything is working now but I want to get the knob off to ease installation of the shifter and the console.