Dead easy.
When the dolmus has gone through the bends on the forest road, you'll see a large white house on your right. About 200 metres past that, on the right, is a 3 storey dirty-white house. Get off of the dolmus there and walk down the track-way beside it. You'll see the stables at the bottom of the hill. It's only about 150 metres.
Alternatively, phone the stables and ask if they can pick you up in Hisaronu or Ovacik.