You'll definitely not want to be on the straight GMRS channel, but on the GMRS repeater channel. Your radio should come with 8 of these programmed in already. Just tune to the correct one (there are plenty of charts online to tell you what GMRS repeater channel matches what frequency). Also, I'm guessing that if your radio is like a lot of others, the menu setting that you need to program the tone into is TX CTCSS (or it might say TX CTCS, but either way it's the same thing). Just plug the tone in there and save it.