Chevrolet 1994 Lumina Owner's Manual page 37

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.
Pull the rest of the shoulder belt all the
way out of the retractor to set the lock.
6. To
tighten the belt, feed the shoulder
belt into the retractor while you push
down on the child restraint.