Remove the old doorknob by unfastening the screws on the rear plate using a screwdriver. Remove the doorknob handle and slide the latch from the inside of the door. Unscrew the strike plate attached to the inside edge of the door.
Insert the new doorknob latch bolt into the hole in the door edge. Line up the Kwikset doorknob cylinder with the holes in the latch. Push the doorknob cylinder into the latch.
Attach the front door knob assembly and insert the screws for the Kwikset into the screw holes in the back door knob plate. Fasten the screws using a screwdriver.
Set the strike plate in the slot on the door edge, and attach the plate to the door with the included screws and a screwdriver.
Test the doorknob to make sure it works.