Hi ofirs,
to me this reads that you either got a very old set, which came without the finder lenses, or you just lack the finder lenses.
I have a three piece Rolleinar 1 set and a two piece Rolleinar 2 set. If you look at ebay item 160322560865 you can see a three piece version. This consists out of two Rolleinar 1 close up lenses (one for the viewing lens, the other for the taking lens, it doesn't matter which one goes where) and the thicker Rolleiparkeil, which corrects the parallax and gets fitted intop of the Rolleinar 1 on the finder lens. Later Rollei released a two piece set, with a standard Rolleinar and a second thicker piece which is a combination of a Rolleinar and the Rolleiparkeil and gets mounted on the finder lens. Check ebay item 130293970981 for an image. The Rolleiparkeil or the thicker combined lens carry the red dot.
I understand very early Rolleinars were not solds as sets, but individually. You had to first mount it on the finder lens to focus, once that was done, you moved it to the taking lens to take you picture. This works only on a tripod and parallax has to be guessed. I am wondering whether you Rolleinars are supposed to work this way. What is pusseling me, is the Rolleinar 3. So far my understanding is, that the Rolleinar 3 was only introduced when Rolleinars were sold as two piece sets.
Concerning the green filter. This is for B&W film and gets fitted to the taking lens only.
Hope this helps
Joachim