You cannot manage Samba through ISPConfig.
Edit: I just noticed that this does not yet support suse 12.3, will that be comming soon?
Chances are it works with 12.3 already, we just didn't have the time to test it. But OpenSUSE is not the recommended distro for ISPConfig. If I were you I wouldn't even consider using SUSE. Use Debian/Ubuntu instead.