1996 Dodge Stratus Entry Key Remote won't work

My remote won't disable the thief system on my car. I replace the battrey in my remote. But again, I can not start my car, as the thief system continues with the directional and rear lights flashing. I cannot, disable the system, by placing the key in the door, and or the inginition. I had to go under my car, and manually start my car with two screw drivers through the starter, to get it home. I need to know, what i need to replace, in order to have my remote work accordingly. Help me.....