Unplug the dryer power cord. Remove the screws in the bottom of the lower front panel. Lift the panel down and away from the dryer to remove it.
Remove the single hex-head screw from the heater element cover with the nut driver. Lift off the cover.
Unplug the two wires leading into the heater element housing.
Remove the two screws holding the heater element to the housing. Slide the heater element out.
Insert the new heater element into the element housing. Install the two screws that hold it in place. Plug the two wires into the housing. Each wire has a unique connector that will only fit in its corresponding socket.
Replace the heater element cover. Install the screw that secures the cover to the housing.
Replace the lower front panel. Replace the two screws that hold the panel to the Kenmore HE3 dryer cabinet.