Chevrolet 1994 Lumina Owner's Manual page 35

3. Pick up the latch plate, and run the lap
and shoulder portions of the vehicle's
safety belt through or around the
restraint. The child restraint
instructions will show you how. Tilt the
latch plate to adjust the belt if needed.
If the shoulder belt goes in front of the
child's face or neck, put it behind the
child restraint.
4. Buckle the belt. Make sure the release
button is positioned so you would be
able to unbuckle the safety belt
quickly if you ever had to.
5. To tighten the belt, pull up on the
shoulder belt while you push down on
the child restraint.