Ford 1996 Windstar Manual page 13

Fastening the front seat lap and shoulder belt
Adjust the lap part of the belt by pulling up on the shoulder
belt until the lap belt fits snugly and as low as possible around
your hips.
Push the release button on the buckle. This allows the tongue to
unlatch from the buckle.
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.
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