Turn off all the branch circuit breakers in the breaker box and turn off the main circuit breakers before replacing the Sylvania R38 breaker. Unfasten the screws that secure the cover plate to the breaker box with a screwdriver and set the cover out of the way.
Locate the circuit breaker that needs to be replaced and gently pry the breaker away from the center of the breaker panel with a screwdriver. Always use a screwdriver with an insulated handle to protect yourself from electric shock.
Pry the circuit breaker off the metal plates in the breaker box and loosen the screw on the side of the breaker you are removing with a screwdriver. Remove the electrical wire from around the screw and discard the circuit breaker.
Fasten the electrical wire to the screw on the new Sylvania R38 circuit breaker with the screwdriver and press in on the breaker to attach it to the metal plates in the breaker box. Press in until you hear the breaker snap into position.
Reattach the cover plate to the front of the breaker box with screws and turn on the main breakers. Turn on all the branch circuit breakers and close the door to the breaker box.