On the Format toolbar, click on the Layer Manager button.
In the Layer Manager dialog window, click on the color to be modified.
In
the Select Color dialog box, do one of the following:
on the Index tab, enter the color number (1-255) and then click OK; or
double-click
on the color palette to open the True Color tab. Specify a color entering the RGB
value or defining the values in the Hue, Sat, Lum boxes, then click on OK.