I'd like to adjust the exposure on selected areas of an image. I use the adjustment brush to try to paint over a dress to bring back some details and I than adjust the exposure amount, though I'm guessing that I am not doing it correctly because it places a pin and I can't seem to paint the whole area. What is the correct way of doing this to make sure the entire area is covered/painted in?
All you have to do is paint the area with the brush.
I don't understand what you mean by "I can't seem to paint the whole area". Exactly what is happening? Describe in detail or show us a screen capture.