How do you disable an aftermarket alarm?

I have a 94 Altima. I pulled a small black box from under the dashboard, just above the accelerator. It has a mess of wires leading to it. Amongst the wires are two fuses. I pulled out one and the car wouldn't start. I put that back in. Pulled out the other and the car starts fine, but the keyless entry no longer works. I hate the noise and my neighbors would hate me. So off it goes, I'll use the darn key as long as I don't have to hear that alarm.