1.Press at the toolbar, and such a
dialog box will pop up:
2. Drag the black triangular handle under the lightness bar to adjust the lightness to what you want or enter the lightness value in the "Lightness" text box.
3. Click at any point in the color wheel then the hue and saturation(the point near the border of the color wheel has a higher saturation) of this point will be applied to your image. In addition, you can also enter the hue angle(0~360) and saturation in the text box directly.
4. Press the "OK" button to close this dialog box.