With center-facing rear seat

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Remove the pin-type retainers and lower rear trim panel.

Fig 1: Locating Pin-Type Retainers & Lower Rear Trim Panel
Courtesy of FORD MOTOR CO.
Remove the C-pillar trim panel floor screws.

Fig 2: Locating C-Pillar Trim Panel Floor Screws
Courtesy of FORD MOTOR CO.
Open the rear seat.

Fig 3: Locating Rear Seat
Courtesy of FORD MOTOR CO.