2003 honda accord, how to activate alarm

I bought a 2003 honda accord today and I was getting ready to leave when the dealer asked if i wanted the factory alarm, i said no and the car was ready when I walked out the door, he checked the disabled box on the auto options. the key has the alarm buttons on it, Is there a way to activate the factory alarm? Sean

call him and ask him

Yes have the alarm installed.
Your key has Keyless entry buttons that can be used with the alarm