2003 Ford Taurus Ford Securilock Problem

i have a 2003 ford taurus i lost my key and had to change my ignition switch but now my car is stuck on side the road as i try to start it engine dont turn over everything works theft light stays on how to get theft light off so my car will start

and i have brand new battery

If a stranger could just pop in a new lock and key then drive away, that wouldnā€™t be much of a security system. You will need to have the new key programmed to the vehicle.