Reviews, reviews, reviews...

Question: How do I get two headsets to work off of one transmitter?

I cannot get my two RS 170 headphones working off of a single transmitter. (It worked once for a short time so I know it was possible.) The directions that came with the sets are very obtuse. Can you tell me easilly how to make these work? And will I have to go through the procedure every time we want to use two headsets instead of one?