Troubles using SuperFish Drop-Down menu

Hello,

I am absolut beginner in using WordPres.
My goal is to create a WEB-site with menu and sub menus.

For this purpose i have installed Superfish Dropdown Menu ver 1.1 and WP CSS Dropdown Menu version 4.2. When entering “Apperance | Menus” i only seem to be handling toplevel menus.

How do i create the dynamic sub-menus?

I’m using theme “Twenty Eleven” (dont think it has any influence)

Thanks a lot for yout support 🙂

Henning