Insert the key into the lock, if applicable and turn it 90 degrees.
Unscrew the trim screws around the knob base with a Phillips screwdriver.
Push the release button on the side of the knob column with the tip of a screwdriver and pull the knob until it begins to release from the door.
Grasp both knobs and pull them away from the door simultaneously.
Replace the knobs on the opposite sides of the door. Make sure the key is in a horizontal position if applicable.
Press the knobs together until they click.
Replace and tighten the trim screws with a Phillips screwdriver.