From the Spell Checker interface, select Select Color from the Options menu.
Then select desired square color from the color grid.
Select Select Color from the Options menu.
If you are using the Swatches tab, select the desired square color from the color grid.
If you are using the HSB (Hue, Saturation, Brightness) tab, click anywhere in the color sure to select a color. You can also enter values for H,S and B.
If you are using the RGB (Red Green, Blue) tab, move the sliders to the desired value for Red, Green and Blue. You can also enter the values for the colors in the boxes to the right of each color.
For all three tabs, the selected color is displayed in the preview pane, at the bottom of the window.
Click Reset and then click OK to save your changes.
Setting Spelling Options
Set Depth for Suggestions
Spell Check a Message