Chevrolet 1998 Prizm Owner's Manual page 20

To fold either seatback down:
1. Remove the head restraints. See "Rear Head
Restraint Removal" earlier in this section.
2. Remove the rear center lap-shoulder belt latch by
using a key to press the release button.
3. Pull the release on the
driver's side in the
trunk.
(Repeat the
procedure for the other
side if you do not have a
built-in child restraint.)
4. Fold the seatback down.