Buick 1993 Century Owner's Manual page 44

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When you sit in a center seating position, or in a station
To make the belt shorter, pull its free end as shown until
wagon third seat, you have a lap safety belt, which has no the belt is snug.
retractor.
To make the belt longer, tilt the latch plate and pull it
along the belt.
Buckle, position and release it the same way as the lap
part of a lap-shoulder belt.
If the belt isn't long enough, see "Safety Belt Extender"
at the end of this section.
Make sure the release button on the buckle faces upward
or outward so you would be able to unbuckle it quickly if
you ever had to.
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