I am trying to alter a specific color in my painting.

The Painter X help menu stated that I should look under effects (I did,) then it said to click on tonal control (I did this too,) it then tells you to select ADJUST SPECIFIC COLORS which I did. It brings up a preview pane- I moved the painting around (in the preview pane) until I could see the color that I wanted to adjust. The help menu said that my cursor would turn into an eyedropper- it did this.

The help menu then said to use the dropper to select the color that you want to adjust by clicking on the color in the painting, I tried this but the dropper would not pick up any color. When I fiddled with the bars to change hue, saturation and value, the color of the entire painting changed. Can anyone figure out what I am doing wrong. I am trying to get the white (only)in my painting to have a blueish tint to add drama.

Any ideas would be appreciated.