There is no factory alarm. You have an aftermarket alarm. It may be a Ford brand dealer installed alarm. You will not find instructions for it in the owners manual. Try to find a dealer that installs Ford brand alarms (not many do) and see if they can provide you with a Zerox copy of the alarm manual. If you can determine the original selling dealer they may also be able to help. They may need to see the car to determine which one you have.
You may also download a copy of the owner's manual from the Ford web site. I don't remember the URL but someone else may be able to post it for you.
