Removed the front off the back panel, unplugged the old unit. Then using a blow dryer heated the old timer to peel the face /cover off and applied to the new clock. Plugged in the replacement clock. Replaced the front of the range.
The only complaint I have is we were not informed that a new face would not be included and the old one would have to be removed and applied to the replacement clock. The face that was on the orginal clock has the buttons to set the clock and timer reversed from the replacement clock we received, so now to set the timer you must press the button labeled clock and set the clock by the one marked timer.