How do I install an infant car seat into the toddler seat?

Fully recline the seat back using the recline strap (not the recline handle), ensure the bumper bar is securely latched, and position the infant car seat facing the parent. Touch the rear vertical surface of the car seat against the rear vertical surface of the bumper bar, then lower and push down until it clicks into the car seat mounts. Always pull up on the front and back of the car seat to confirm it is properly locked. (Pages 21–22)