Click "Add button" and "Add submenu's item's buttons to create your menu.
You can use ready to use Templates. To do it just select theme you like in the "Button themes" and "Submenu themes" list. Then you can browse this theme's button backgrounds. When you find a button background or submenu theme you like, double-click it to apply.
Select vista button or submenu by clicking it and change button appearance for normal and mouse over states and set buttons/submenus link properties and link target attributes.
Save your menu as project file, as HTML page or insert your menu into the existing HTML page