The instructions depend entirely on which aftermarket remote starter system was installed. Look for:
* A sticker or label: Often, installers place a sticker somewhere in the vehicle (under the dash, in the glove box, or on the sun visor) with the brand and model of the remote starter and instructions.
* The remote itself: The remote will likely have instructions printed on it or in a small booklet that came with it.
* The installer: If you didn't install the system yourself, contact the installer directly for instructions.
Without knowing the specific brand and model of your remote starter, it's impossible to provide precise instructions. Generally, however, aftermarket remote starters use buttons (often with car-shaped icons) to start, stop, and sometimes lock/unlock the vehicle. Read the instructions carefully as different systems use different combinations of button presses and hold times.