Buick 1994 Century Owner's Manual page 34

To unbuckle the automatic belt, just push the button on
the buckle.
To reattach the automatic belt:
1. Close and lock the door.
2. Adjust the seat (to see how, see "Seats" in the Index)
so you can sit up straight.
3. Pick up the latch plate and pull the belt across you.
4. Push the latch plate into the buckle until
it
clicks.
Don't let it get twisted.
Pull up on the latch plate to make sure
it
is secure.
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