the Insert -> WebAssist -> CSS Menu Wirter access point will open the css menu writer wizard.
On the initial screen, there are select lists to choose from the various presets for saved Menus, Menu Contents Design and Themes.
To edit the contents of the menu, click the Define Button next to the Contents list.
to edit the look of the menu, click the Define button next to the Theme list.
To edit the menu, select the menu in design view, then look in the property inspector, the property inspector (Window -> Property Inspector) will have an edit button.
NOTE: if you have applied the menu to a static HTML page, go to Edit -> Properties. In the Invisible Elements section, makes sure that scripts is selected. next to the menu you should see a shield icon, select the shield icon to rigger the edit option in the property inspector.