Britax Agile Plus User Instructions page 28

18. INSTALL THE INFANT CARRIER (Sold Separately)
E Release the handle latches. Then with one hand holding the front of the Infant
Carrier, push the Infant Carrier handle all the way down until you hear it lock
into the adaptors. The handle indicator should now be GREEN and the Infant
Carrier should be locked into the adaptors.
If the indicator is RED the Infant Carrier handle is not in the locked position,
repeat step D.
E
IMPORTANT: Ensure that the Infant Carrier is locked into place by
pulling up on both sides. Do not use the Infant Carrier if it is not correctly
installed.
Please Note: The Infant carrier has been fitted with a hood when using the
stroller. The hood can also be used in the car. Refer to the Infant Carrier
instructions regarding placing and securing your baby in the Infant Carrier.
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Indicator