Car Electronics Questions? Ask an Electronics Expert for Answers ASAP
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Try finding, under the dash and on the driver's side (usually) you will see a little box mounted there, with a button on it. Put the key in the ignition, and turn it to On. Then, press that button briefly, just press-it-and-release-it, and you will put the car into Valet Mode, in which mode, you can drive the car, etc. and the alarm will be disabled.
Other measures will be needed to reset the alarm back to the way it should operate... but I can't say exactly what to do, without knowing what kind of alarm it is.