To Modify a Material Definition Using Apply Material Tool

Select the Apply Material tool.
In the tool settings window, click the Query icon.
Select an element in the design that has the material attached and accept.
The palette file opens, and the material displays in the preview box.
Do one of the following:

Double-click the material preview box.

or
Right-click in the preview window and select Edit Material from the menu.

The Material Editor dialog opens, with the required palette and material selected.
Use the controls in the dialog to make the desired modifications.
In the Material Editor dialog, click the Save Palette icon.