Ford 2006 F150 Owner's Manual page 113

Using the armrest (if equipped)
Push the release control to move
the armrest up or down.
Using the manual lumbar support
For more lumbar support, turn the
lumbar support control toward the
front of vehicle.
For less lumbar support, turn the
lumbar support control toward the
rear of vehicle.
Adjusting the front power seat (if equipped)
Never adjust the driver's seat or seatback when the vehicle is
moving.
Do not pile cargo higher than the seatbacks to avoid injuring
people in a collision or sudden stop.
Always drive and ride with your seatback upright and the lap
belt snug and low across the hips.
Reclining the seatback can cause an occupant to slide under the
seat's safety belt, resulting in severe personal injuries in the
event of a collision.
Seating and Safety Restraints
113