Buses from La Azohia into Puerto Mazarron

I know there are (infrequent) buses but not speaking Spanish I have never known whether they only stop at the designated stops or whether you can request to get off (I've not seen a bell to press). I have a property on El Pinar de San Gines so going is fine from the stop down on the road. But coming back do you have to go all the way down to the marina for it to turn round and then get off at the same stop?