Fiat 2015 500e Owner's Manual page 152

150 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
Push down the release button, located at the outboard
top of the seatback and move the seatback to its folded-
down position to provide a flat load floor cargo area.
When returning the seatback to its upright position, push
rearward until the seatback is properly latched.
Folded Rear Seats
Rear Seat Release Buttons