I installed opensuse 11 Gnome, just to try it out.
Normally i use KDE. (Mandriva, Kubuntu)
After that i installed KDE too, with Yast,>> software, i installed a KDE-program, with a lot of dependences (KDE???)
What do you mean it doesn’t work? It should be in the menu under “Administrator.” You should have to type your password in a popup box and then all the settings appear. There’s a left pane and the one you want is “Software.”
Try starting it in a terminal with sudo and see what happens if it’s not in the KDE or Gnome Menu.