Honda Prelude 1990 Online Reference Owner's Manual page 5

Front Seat
Adjust the seat position by pulling up on the adjustment lever under
the front edge of the seat cushion, and sliding the seat to the
desired position. Then release the lever and make sure the seat is
locked in position by moving it back and forth.
ADJUSTMENT
LEVER
The angle of the seat-back can be changed by pulling up on the lever
at the outside edge of the seat and leaning forward or back. Release
the lever and let the seat lock into place when it reaches the desired
angle.
Seat belts are most effective when the driver and passenger are
sitting up straight and well back in each seat.
Minor Adjustment of Driver's Seat-back Angle (Si)
For minor adjustment of the driver's
seat-back angle, move the lever at
the lower left side of the seat-back
forward or backward.
Do not adjust the driver's seat while the car is moving; the seat
could move suddenly, causing loss of vehicle control.
To reduce the risk of sliding under the seat belts in a collision,
the seat-backs should be reclined no more than is necessary for
comfort.
Seats
RELEASE LEVER
LEVER
(cont'd)