The best way to get to Ribasevina is from Uzice, by bus or by car. Distance from Uzice to Ribasevina is long 20 kilometers. Also to Ribasevina you can travel from Kosjeric as well. Distance from Kosjeric to Ribasevina is 18 kilometers long, but better road is from Uzice.
To move around Uzice you just need to walk, but if you want to go to Mokra Gora or Zlatibor, you need to take the bus from the station, near the river. Ask the driver where to stop, and he will advice you when you arrive.
Another option we did to return from Mokra Gora, because there are very few buses to come back to Uzice, was autostop. We we lucky, we wait very few time, and the people who wanted to carry us was sooooo pleasant (like almost all serbians). And even they carry us to the door of the hotel, when they didn't had to come to Uzice....i'll be thanful forever.