Michael,
michael_ wrote:shooting RAW means you have the full uncompressed detail of the image and can edit it without destroying it, which means you can make as many changes as you like and still revert back and it wont effect the image quality
Feeling pedantic tonight
... one simply reverts, rather than reverts "back". Where else would you revert to?
Elena,
Grab a copy of ViewNX or Nikon View; either will work with your camera. They come with a basic version of Nikon Edit, and you'll find a great deal of capability within those quite basic programs, including the ability to
modify your wb settings.
What Michael was saying is correct: images saved as raw have your settings stored as parameters that get applied to the image at display time. When you change a setting, the new values get stored, but again as parameters, so you're always looking at the baseline image, with the paramteres then applied.
With a jpg, those settings are applied to the image, which is then saved in a lossy compressed format. Load the image, make a change, and then save, and again the image gets saved in a lossy compressed format, but this time, because you started with less detail, and the process of saving causes more detail to be lost, your image file, as saved, starts to degrade. The more you change and save, the greater the degradation.