Ohoh. YAST can't configure networmanager (yet?). You even have to disable "ifup" in the appropriate YAST-menu to get networkmanager running -- sorry, I forgot to mention that in my first post.
Don't click on it. Run the command from a console, you'll get more information (error messages) there. Then run (again from console)
That will tell you whether Networmanager is up and running.