Tesla S Owner's Manual page 30

Tesla Built-In Rear Facing Child Seats
2. Push the lever to release the head
supports from the seat back, then fold
back onto the seat.
3. Secure the Velcro strap.
4. Pull the strap at the rear of the seat to
fold the seat assembly into the trunk floor.
5. Replace the cover on the trunk floor.
28 Model S Owner's Manual