If you are still shooting JPEG and you are not sure why you should be shooting RAW, check out my “RAW vs JPEG” article. This tutorial will only work on RAW images, so make sure that you are picking a RAW file before attempting to follow the steps. Lightroom will not let you change white balance or color profiles on JPEG images and although you can tweak some things like color temperature and tint, I still do not recommend messing with those. If you want the best image quality and the most options for post-processing, you should be shooting RAW.
2) Fix White Balance