Very carefully and gently, pry up on the push-button using a small flat bladed screwdriver. You'll find there's a slot at the "front" or the "rear" of the button just down from the top edge that you can use. Once the button is off, you'll see a snap ring that holds the remainder of the shift knob on.
However, removing the button won't allow you to remove the console because the shifter is also bolted to the console underneath and to the floor. There's a screw at the front of the console that goes down into the floor, two more screws underneath the console compartment (remove the insert) at the rear, then two bolts that secure the back of the shifter to the floor. Once you remove all that, you can lift the console up a little and tilt it to the side. You still have to disconnect the shifter cable. Either you can disconnect it from the transmission and pull the whole cable out with the shifter still attached to the console, or you can disconnect the shifter cable from the shifter. To disconnect if from the shifter you have to remove the trim plate from around the top of the shifter (you have to remove the knob to do this), go in from the top and disconnect the cable, then tilt the console over to the side and remove the clip that holds the shifter cable body to the shifter.