Learn how to quickly and easily adjust an image’s White Balance
In the Lightroom Basic panel’s White Balance area is a White Balance Selector. You can get to it by pressing the letter W. Hold the White Balance Selector over an area of the image which should be a neutral color, such as gray, black or white – gray is the better choice.
You will see the Loupe appear (which is a grid of 25 cells showing the color under and around the cursor). Click once to set the white balance, using the center color as a reference. If the result isn’t what you want, click again to sample another area. Continue until you get a good fix for the image.