Use the touchscreen to select the following:
Synchronize Settings  Select the settings option on the feature bar.Ambient Lighting  Select ambient lighting.
Ambient Lighting
Switching Ambient Lighting On
Touch a color once.
Changing the Color
Touch any color once.
Adjusting the Brightness
Drag the selected color up or down.
Switching Ambient Lighting Off
Touch the selected color once or drag the selected color down to zero brightness.