Please provide detailed removal, and installation information.
To remove the knob, it will unscrew from the timer. For the timer to be removed, you will want to remove a screw from the endcap on the back of the unit from both sides. Once removed you will slide the bottom of the panel forward and up. Once this is done you will disconnect the wiring and connect to the new timer. Remove the screw holding the timer in place and slide the timer over and out. Install the new timer and reassemble the unit.