3. Configure Keys (Key Attributes)
Select a key, then select Edit Key. Alternatively, double-click on the key. The Key Attributes screen will be shown for the selected key with the existing settings for the selected key. If any key locations are not to be used, they can be deleted. If the legend needs additional keys, those can be added.
area allows the selection of a foreground image to be placed on the key. Unlike the background image, this image may be sized and positioned anywhere on the key.