You can use your own custom menu buttons graphics and upload them individually for each page by clicking on rename [Aa] for each page, then click "Browse" next to "Menu Button Image" then browse and select your menu button, then click save.
Note you will need to create and upload your own menu buttons graphics or we can create these for you.
Not all menus can be edited or updated this way, a lot of our menus are CSS menus and there fore can only be edited via the CSS (stylesheet), this will require us to add your custom menu button for you... the customization only extends to background image, so you will not be able to have custom fonts for the buttons.