How do you swival the middle seats on a 1995 Toyota estima lucida?

ON my '93, there is a button at the front base of the seat. You have to push the button into the seat (toward the back of the seat) and then the seat will swivel.

I am a separate person adding to this answer... on a Toyota Previa van (1993) the button you push in to swivel the middle seatsaround 180 degrees is right next to the lever you lift to move the seat itself forward and back at the base of the bottom of the front of the seat. The button is left of the lever as you face the seat. Once again... note: the button is on the bottom front of the seat near the middle, NOT on the sides or back of the seat.