I have a 1993 lincoln towncar and i need to know how to change the security code so i can crank my car

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Hi,
My name is Ben and I'm your guru, i.e., mentor, an influential teacher or popular expert: a management guru. - origin from Sanskrit, 'weighty, grave', for today.
Based on the age of the vehicle, I' only going to suggest one fix, Trying to change a security code is an expensive and time consuming undertaking.
ABSOLUTE SOLUTION: Go on eBay and buy an anti-theft bypass module for $10-$20 depending on the year,make and model of your vehicle. This is a job that you can do yourself.
All the best
Ben