On this page there is a very good description of the route to Cjajnik and further to Košutnikov turn. For navigation the place is Zell Pfarre, but there's already a right turn-off earlier to Koschuta haus (well marked). The road is gravel, no problems. Parking fee must be paid at the hut.
At the top of Cjajnik you descend (if going on to Košutnikov turn) to the other side and then in the middle of the wall you see a junction - yellow signs, look for Lärchenscharte. After the end of the ferrata a steep path leads to the Košuta ridge. To Košutnikov turn there's still quite some walking, even though it looks very close. For a loop route, go back to the junction to Planina Dolga njiva, and continue until you spot the ÖTK Steig sign on the right. We had quite some trouble finding this path despite the map. Equip again with helmet and full set, recommend gloves too. Cross a bridge on the path. Fantastic experience. The last part of the ferrata is very crumbly and requires great caution. Then scree slope, forest walking and you reach Koschuta haus. Regards