Buick 2007 LaCrosse Owner's Manual page 60

5. 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. If you are
using a forward-facing 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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6. If your child restraint manufacturer
recommends using a top tether, attach and
tighten the top tether to the top tether anchor.
Refer to the instructions that came with the
child restraint and see Lower Anchors
and Tethers for Children (LATCH) on page 51.
7. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, if the top tether is
attached to the top tether anchor, disconnect it.
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.