Papa p - first of all, notice the colours - especially if you get one out of icmeler. Different colours are an indication of the route - icmeler, marmaris, armatulan etc. If you're unsure, just ask the driver.
easy to use - there's stops along routes, always used these in icmeler/marmaris but in other places you can just put your hand out to stop it. 1.5 lira from
icmeler to the harbour at
Marmaris - not sure about dolmus to other places. Get on, find a seat then pass the money up the bus via other passengers to the driver - or you can hand it to driver then sit down. In tourist areas, drivers are used to people new to the dolmus, so just get on and enjoy the ride.