You might want to create a large space between your rear seats so that you have more room to work on this.
First of all you need to find the marker for the 3rd row seat. Only when the 3rd row seat is in this position, it can be lifted up from the rail. I have tried but somehow my old digital camera couldn't get me a clear picture of the marker as shown below.
Maybe because of the beige colour and the reflection from the side wall from the flash light such that the marker doesn't come out clear. However, you should be able to find it right in front the edge of your 3rd row seat. I have circled it in the above photo.
Slide your 3rd row seat so that the front edge of the seat is level with the marker.
Now pull the level on the side of the 3rd row seat (as shown below) to lower the backrest so that it is flush with the seat.
Here is a view from the rear of the car when the 3rd row seats are in flat position when the backrests are lowered.
Now pull the level that lock (as shown) the 3rd row seats to the rail on the floor to release the seats.
Once the seat is released from the rail, you can lift it up as shown below.
Finally under the seat, there is a velco strap that you can hook your seats to the roof-hook as shown below.
Give this a try if you want to fold your 3rd row seats.
Hope this help
Hope this help