How do I modify the contrast/brightness/adjust color of only a PORTION of a picture?

I'm working with Adobe Photoshop Elements version #10. 
How can I adjust the contrast/brightness/adjust color etc. . .of just a PORTION of a picture, and not the entire picture?
I've tried "defining" an area that I want to change by using a lasso tool, but when I custom draw an area of the picture, I don't see
any option that lets me adjust the contrast/brightness etc....of that section.
Many thanks for any help.
Kevin
([email protected])

Once you select it, anything you do should apply only to the selected area, or you can create a new layer from the selection, too. So if you make a selection and apply levels, it should only change the selected area. The new layer gives you the option of going back later to change or delete your corrections.
For what you want to do you can also use the smart brush, which lets you select and apply corrections in one go. Just sort through the smart tool's options in the options bar's  thumbnail's popout menu till you find what you want.

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