How do I know if the seat is properly locked before driving?

The Seat Lock Indicator must show GREEN before driving — this confirms the seat is locked and safe for travel. When the seat is in the rotated loading/unloading position, the Seat Lock Indicator will be RED. The Revolve360 Slim must be locked whenever the vehicle is moving, as it is not designed to protect your child in a crash when unlocked. (Page 41)