Ford Mustang Owner's Manual page 119

WARNING: To minimize the risk of neck injury in the event of a
crash, head restraints must be installed properly.
Adjusting the manual seats (if equipped)
WARNING: Never adjust the driver's seat or seatback when the
vehicle is moving.
WARNING: Always drive and ride with your seatback upright
and the lap belt snug and low across the hips.
Lift handle to move seat forward or
backward.
Pull lever up to adjust the angle of
the seatback.
2011 05+ Mustang (197)
Owners Guide, 1st Printing
USA (fus)
Seating and Safety Restraints
119