Programming car alarm remote

I just bought a 94 Accord about 2 months ago. The guy that sold it to me has an alarm installed on it but he doesn't know if it's stock. It's the annoying multitoned alarm. If you've heard it before, I'm sure you can tell which tone will play next. Anyways, I had him send me the spare remote but it's not programmed. How do i program this remote? I already have one remote that IS programmed although it's buggy and sometimes doesn't work. It's it's a two button remote (one black, one green) and it says Hellfire on it. No manual came with the car. Any suggestions?

I suggest pulling that alarm out and trashing it. It is one of the worst ones out there. It rates right up with Bulldog!