Turn off the main power to the circuit. Run a black, white and red wire from the first alarm to the second alarm.
Connect the black, hot side of the AC line to black wire you have run to the second alarm and also the black wire on the AC quick inter-connector of the first alarm.
Connect the white, neutral side of the AC line to the white wire you have run to the second alarm and also the white wire on the AC quick inter-connector of the first alarm.
Connect the red wire from the AC inter-connector on the first alarm to the red wire you have run to the second alarm.
Connect the black, white and red wires on the second alarm's inter-connect to the wires you have run from the first alarm. Match the colors.
Continue following the same protocol until you have connected all the alarms.