Well, I just went and looked, and I cannot find anything that indicates that keyless entry was standard on the '94-'95 GT. I thought it was, but after some research, I have personally changed my mind. I now believe that it was included in one option package that also got you the Mach 460 sound. But, it was possible to order the Mach sound system independently from that package that included the keyless entry, so it could be that you do not have it.
That being said, if you do in fact have it, the quoted stuff below tells pretty clearly how to program the remote...
Copied from the web -
"The keyless entry module in the car is located inside the trunk, behind the driver taillight, recessed in the quarter panel. You will have to remove the felt panels inside the trunk to gain access to it. It will be a little black box, probably about 5" square attached to a black rack thing that holds it in place. There will be several wiring harnesses running into it, but the one to take notice of is a wiring harness with only two (2) wires. It should be on the outside of the mounting piece. Turn the car to key on, engine off (KOEO) then using a screwdriver or a jumper wire, connect the two wires in the connector, temporarily. When you do so, the locks in the car will cycle to signal that it is in programming mode. Now, press any button on the remote (like lock or unlock) and I believe the locks will cycle again, do this for every remote you want programmed for the car (max. of 4 remotes) when you are finished, turn the key off and the locks should cycle one last time to signal the end of programming mode."