P&GD 2013 was I believe version 8. It didn't have region tools (although it did have a mask tool).
Use the Mask and then the rectangle tool to draw boxes over the areas you want to change. You can then use the Enhance Photo's > Set Photo Hue > Hue and Saturation, as Steve said above ....
So it can be done ... if I can do it, anyone can. My screen shot (although virtually the same as Steve's - Sorry Steve!) was done in P&GD 2013.
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