My starter went out on my car I replaced the starter and once I replace the starter my theft light keep blinking off and on and I guess it doesn't recognize the key when I try to turn it on and it's n

Put the key in the ignition, and turn forward all the way just before cranking. Then within 5 seconds, locate, press and hold in the valet/overide button, found under the dash area, (push button, spring loaded) until the installed LED (the blinking light) in your dash area goes on solid, and the siren chirps once. (Your valet switch might be the toggle (on/off) type. in this case, key on, flip switch in opposite direction, then turn the key off.) This should reset the alarm, and reset the grounded relay on the starter wire, allowing you to start the engine. At this point, the only thing working would be the keyless entry from the alarm, if it came equipped that way. Just Repeat these steps to place it back to usable armed mode. You may get 2 chirps, confirming it, and the lights may flash twice as well. That should do it. Hope this helps!!