Buick 1993 Skylark Owner's Manual page 44

When you sit in a center seating position, you have a lap
safety belt, which has no retractor.
To
make the belt
longer, tilt the latch plate and pull it along the belt.
To make the belt shorter, pull its free end as shown until
the belt Is snug.
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 upwa
or outward so you would be able to unbuckle it quickly
if you ever had to.
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