Pontiac 2002 Grand Prix Owner's Manual page 56

6. To tighten the belt, feed the shoulder belt back
into the retractor while you push down on the
child restraint. You may find it helpful to use
your knee to push down on the child restraint
as you tighten the belt.
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7. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, just unbuckle the vehicle's
safety belt and let it go back all the way. The safety belt
will move freely again and be ready to work for an adult
or larger child passenger.