Oldsmobile 1996 Silhouette Owner's Manual page 26

3. Pick up the latch plate and pull the belt across you.
Don't let it get twisted.
The shoulder belt may lock if you pull the belt across
you very quickly. If this happens, let the belt go back
slightly to unlock it. Then pull the belt across you
more slowly.
4. Push the latch plate into the buckle until it clicks.
If the belt stops before
it
reaches the buckle, tilt
the latch plate and keep pulling until you can buckle
the belt.
Pull up on the latch plate to make sure it is secure. If the
belt isn't long enough, see "Safety Belt Extender" at the
end of this section.
Make sure the release button on the buckle is positioned
so you would be able to unbuckle the safety belt quickly
if you ever had to.