There should be 1 knob on the top of each rear backrest, nearest the door, next to the headrest.
Pull the knobs upward while pulling the backrest twords the front of the vehicle.
This should fold the backrest down and onto the rear seat.
Make sure your front bucket seats are positioned all the way into the most forward resting position.
There is a lever in front of the bucket seats for this adjustment.
Once the bucket seats are out of the way, you can pull the whole rear seat assembly up and forward into a position resting on and or nearest the front bucket seats.
Hope that helps. Good day.