If you did install it correctly then it should be in your K-menu.
K-Menu -> Utilities -> Desktop Widgets (SuperKaramba)
Superkaramba itself dosnt do anything however, you need to download themes for it to run. You can get some from
http://www.superkaramba.com/ or from the karamba section of
http://www.kde-look.org
Once you have a theme open Superkaramba and click the Open.. button under "Open Local Theme" and find the .theme or .skz file that you downloaded, click ok and it should be up and running.