How to Customize the Start Page

How do I add Top Sites to the start page? My start page only shows five! And it also does NOT show any "frequently visited" although I have that selected in the start page preferences! So what's going on?

It seemed like at one point we could add them by dragging a website url to the start page box in the toolbar, but now that only adds them to the "reading list" which is a royal hassle, as it means if I move my mouse to the top or bottom of a window, it may suddenly switch to the next reading list site above or below it, which IMHO, is crazy ridiculous. There's not even a setting for the Top Sites on the start page, and we can do to the ones it chose to put there is delete any we don't want, no way to add more. And I don't know why there's no frequently visited sites, as that would be a big help. Any ideas?