How do I check if the rear-facing recline angle is correct?

Check the level indicator on the car seat and ensure the bubble is completely within the blue zone, with the vehicle on level ground. There are 6 recline positions total — positions 1, 2, and 3 are for rear-facing use. If needed, rolled towels may be placed under the car seat at the vehicle seat crease until the bubble is in the blue area. (Pages 2, 24)