I tried to apply sharpening, blur and when I tried to save the picture… it had a vertical rectangle bar embedded in the photo where it darkened the photo. How do I get rid of it?
At least on your screen res jpeg, it looks like you darkened the image through a rectangular selection. All you really need to do is to zoom in to the image and make an accurate selection of that rectangular area, and then use a Curves Adjustment layer to lighten the rectangle back to where it used to be.
I agree with Peter, use Curvels (or levels) to brighten it back up. It may be hard to exactly match the lighting, so you may be left with some "seams" where the rectangle was, so you can use the healing brush to blend those seams.
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