there are 2 methods out there I'm not sure which one works for the 95. I know on the newer stangs you do this,
put the key in the ignition and cycle it on/off 8 times ending in the run/acc position...at the same time you are doing this hold down the lock button on the remote, the doors should lock. do this for the other remotes, the car can handle up to 4 remotes. here is a vid of what I am talking about, ignore the year it works on other years also,
here is the other method if that one doesn't work used for early years. then open the trunk,pull the interior panel off on the left side and you should see a small black box.There will be a small connector near the box that is not connected to anything...connect a jump wire to that connector to jump the pins and turn your key switch on and you will hear the doors lock, unlock, next push the lock button on your remote until it starts to work. remove the jump wire and you are done.