1) I assume you want the smoke detector always on 24 hours. Double check if 4 jumpers of mode settings is setting liked this.
2) Put in the 9V battery
3) Press and hold the TEST button on the cover, should see light and beep. Self Test passed, power no problem.
4) As normal configuration mode of your alarm, learn the sensor as usual. It should be switch alarm to configuration mode, then press the TEST to trigger signal, detector sound and see GSM Alarm indicator flash. Sensor learnt.
Finished & ready for use.