Help for new user with navigation menus

Hi. I am a new Siteassist user and am having trouble learning how to configure and use the drop-down horizontal menu created initially with a site assist template. I did configure the pages initially and I thought successfully. It appears to have created a css similar to a library. I am now trying to format the menu (font, size, colors, etc.) When I attempt to make these changes either in the css for "topnavigation" or a:link, neither affects this menu. Also, when I preview the page in a browser, the menu does not show at all. Is there some basic documentation or a tutorial to help with this? I have not found any help in documents, faq's or forums. Do I have to purchase the CSS Menu product? I could create these menus manually but thought the template would be quick and easy.
Thanks for your time!