I wanted to try HDR. One of the things that makes things harder to learn than when there were books included with programs is the diffuseness of the help. I click online help and there are a lot of topics but the first one isn't simply HDR in CS6. there are first ones about errors, faux, etc. I choose one that seems more basic, but it is for CS5, so I don't know how it differs, if at all.
But I follow the procedure and the tutorial, and when I get to the screen with the selection at the bottom and the controls at the right, I find that, unlike the video, when I click on one of the bottom image, a green selection border does not occur and cliciking any makes no difference in the large image. In other words, I can't select any individual image as in the tutorial.
Once I clicked on the curves box and adjusted points, a green border appeared around one, and now I can select. Previously I had adjusted other parameters.