From the Master Categories dialog box you can edit the available categories.
Add new category
Click the 'Add' button a new dialog box will appear:
Type in the name of the new category and choose an image by which it will be represented.
Click OK to confirm your choice.
Delete one or more categories
Select one or more categories from the list.
Click the 'Delete' button.
Reset categories to their default values
Click on the 'Reset' button.
A message box appears asking you for confirmation.
Click 'Yes'.