Unplug the power cord from the electrical outlet. Turn off the gas supply leading to the oven.
Open the oven door. Slide the oven racks all the way out and set them aside.
Unlock the two slide tabs at the back of the oven floor. Slide the oven floor out through the front and set it aside.
Remove the screws holding the burner assembly shield in place. Lift the shield out of the oven.
Unplug the wire harness leading to the igniter.
Remove the two screws holding the igniter to the burner assembly, then remove the igniter and set it aside.
Position the new igniter onto the burner assembly. Install the two screws that hold it in place. Plug the electrical wire harness together.
Replace the burner assembly shield. Install the screws that hold it in place.
Replace the oven floor. Set the locking tabs back to their original position at the rear of the oven.
Slide the oven racks back inside the oven.