Submitting a new weight machine exercise

I was wondering how new weight exercises are added to the "Strength Training" section of the training log?

I routinely do the Pec Deck machine and then turn around and do a reverse Pec Deck (for the back I would assume, as opposed to the chest as the "regular" pec deck), but I don't see an option for that on any of the pull downs menu options.

Could it be added? Or is it called something else? I am assuming others of us do it, and not just me...

Thanks!