OK boys and girls, here is something a bit beyond the basics. Now that you know how to use an overlay and Color Curves, lets expand on that knowledge to more accurately set the range of adjustment by letting Vegas Video calculate it instead of just eye balling it by using something called Complement Offset values. I know that's a mouthful, but it is easier than it sounds. In effect you can easily make custom filters that will accurately remove any color tint from any image more accurately then adjusting a single color channel alone just using curves.
Then once you see how to do that, see how what you learn in tutorial three can be applied to make a more powerful HSL filter.
http://www.wideopenwest.com/%7Ewvg/tutorial-3.htm
Enjoy.