Car Alarms: Factory remote not working, cant start car, alarmtek, dash area

Question
I have a 2006 Mustang with a factory alarm.  The remote does not work and now I cant start the car.  I have changed to batteries and it still will not work.  I have looked but cant find any kind of valet switch.  Would you know where it might possibly be.
Thank you for your help.

Answer
Please be more descriptive if possible.

"GOING OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
(doubtfull since none of the notes show this
car as having a factory alarm system)=FACTORY

Or,

is it: flashing parking lights,
an LED in the dash area, and a siren
going off?= AFTER MARKET

Let me know more on this to better
advise you on a course of action
to take.

Best Regards,

Robert Martin
CEO/ALARMTEK
CARALARMMAN.com