Turning on/off Honda Civic Alarm?

I have a 2009 Honda Civic coupe. I have had it for five years and never knew it had an alarm. Today while trying to get out of the car (I had to manually unlock the doors which was odd) the alarm went off when I opened the door. It hit all the buttons on the key to get it to stop, put the key in the ignition and started the car, tried pressing break and gas, nothing worked. I looked in the manual and couldn t find anything about alarm. It finally stopped, but as soon as I tried to leave again It started again.
This time, I left the door open until It stopped so I could get out of the car. It hasn't done it again since, but I d like to know how I turned it on and how to shut it off.

The PCM is likely not reading the fob. Change the fob battery. Clese the door (alarm will beep). Open the door with the key in the slot, turning left, then right then back to center. Alarm should stop. Do this 2 or 3 times. No joy, you might need to get the PCM reprogrammed.

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