Move the treadmill to the flat position and turn it off. Unplug the treadmill. Remove the safety key.
Loosen the belt by unscrewing the bolts on the right and left end caps at the rear of the treadmill. Loosen the bolts a few turns until you can pull the belt off the deck a few inches.
Lift the belt and spray or squirt lubricant on the underside of the belt in the location you typically walk on. Spray or squirt enough lubricant to wet the area.
Re-tighten the hex bolts at the rear of the treadmill to pull the belt tight against the deck.
Place the safety key on your waistband and plug the treadmill in. Set the treadmill to a slow speed, press "start" and walk on the deck for 3 to 5 minutes to spread the lubricant around the deck.