Alarm Issues

I have an 89 525i bmw. I have an aftermarket alarm that came with the car and I do not see a kill switch. The alarm is tripped and closes my windows and sunroof. It also has the door where they do not unlock. My question is how do I go about shutting off the after market alarm.

I have an 89 525i bmw. I have an aftermarket alarm that came with the car and I do not see a kill switch. The alarm is tripped and closes my windows and sunroof. It also has the door where they do not unlock. My question is how do I go about shutting off the after market alarm.
You gotta get inside the car.