Park the golf cart, and turn off the engine.
Raise the golf cart engine cover, to access the drive belt inside the engine compartment. The drive belt is plainly visible.
Loosen the drive belt tension bolt, with the open end wrench, on the front pulley.
Slide the old drive belt off the front drive clutch pulley, and then the rear clutch pulley.
Slip the new belt around the golf cart's clutch pulley, and then stretch it out over the front pulley.
Pull the front pulley forward slightly to increase the belt tension, and then tighten the tension bolt with the wrench.