The inside lane (left) shouldn't be turning right at the first exit. This lane should carry round to the second or U-turn part of the roundabout.
The middle lane has the option to turn right at the first exit or continue round and should usually exit on the second right.
The lane on the outside (right) should turn right. It's fairly easy but not if you are local in a 4 x 4 who doesn't care either way as they are going to go wherever they want to!
Oh and the white lines are meant to be lanes that the car is supposed to stay in-between until you want to exit!