Flaming river rack and pinion?

Never doing this before. What I'm asking is, how do I adjust the tie rods. I know there is a coupler between the tie rod and the threaded rod coming from the rack and pinion. One has right hand threads and the other left hand threads. Is this what I turn? I just looked at both tie rods and they both appear to be turned into the coupler, all the way. I don't think that's correct.
And thank you for your reply.