GMC Chevrolet Silverado 2500HD 2021 Owner's Manual page 90

Tilt the latch plate to adjust the belt if
needed.
4. Push the latch plate into the buckle until
it clicks.
Position the release button on the
buckle, away from the child restraint, so
that the seat belt could be quickly
unbuckled if necessary.
5. Pull the shoulder belt all the way out of
the retractor to set the lock. When the
retractor lock is set, the belt can be
tightened but not pulled out of the
retractor.
Seats and Restraints
6. To tighten the belt, push down on the
child restraint, pull the shoulder portion
of the belt to tighten the lap portion of
the belt, and feed the shoulder belt back
into the retractor. When installing a
forward-facing child restraint, it may be
helpful to use your knee to push down
on the child restraint as you tighten
the belt.
Try to pull the belt out of the retractor
to make sure the retractor is locked.
If the retractor is not locked, repeat
Steps 5 and 6.
7. If the vehicle does not have a rear seat
and the child restraint manufacturer
recommends using a top tether anchor,
attach the top tether to the top tether
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