Ford Windstar Owner's Manual page 172

Seating and Safety Restraints
Unfastening the combination lap and shoulder belts
While the belt retracts, guide the tongue to its original position
to prevent it from striking you or part of the vehicle.
Shoulder Belt Adjustment (Driver and Right Front
Passenger)
You can adjust the shoulder belt height to one of five (5)
positions. To adjust, pinch the release button and slide it up or
down until the belt rests on your shoulder near your neck.
Release the button and make sure the adjuster is firmly seated
in one of the five (5) positions.
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