You can use this dialog to apply changes to your .css file (create, modify or remove styles).
To display this dialog click the Change Styles button in the Styles group under Home tab and select Manage Styles.

This dialog provides you with:
- a list with the available styles
- a preview of the selected style applied on the name of the class
- the attributes contained in the class
- buttons for creating, modifying and deleting styles from your .css file.