BuddyPress.org

You’ve more or less got the structure correct.

– I don’t believe “title” is a valid attribute for li and ul tags. If your goal is to display the word “Community”, you’ll have to put it outside the tag like so:

<li>Community...

– I assume that your purpose is to make the Community submenu (Activity, Members, etc) a dropdown menu that is invisible except when you hover over the header Community. That’s a CSS issue. I recommend you find a WordPress theme (or any website, really) that has such a feature, look at the source code and especially the CSS, and emulate the necessary rules. You could also check out a tutorial, like the “horizontal” menu bar described here: http://www.seoconsultants.com/css/menus/tutorial/.

Good luck!