Ford Windstar Owner's Manual page 159

3rd row seat (seat position)
To convert the bed to a seat:
From the rear of the vehicle, pull the release lever down and
1.
at the same time lift the seatback up. Raise the seatback to
the full upright and locked position.
Make sure the safety belts are free and available for use.
2.
The seat/bed should not be occupied while the vehicle is
moving unless it is in the upright, fully-latched position.
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