Dear matjazs,
Welcome here (I see this is your first post).
Please when you want help, take into account that we here are all volunteers spendind some spare time in helping out fellow openSUSE users. Therefore try to make it as easy as possible for those helpers by telling as much as possible, backed by computer commands and their output whenever possible.
What is missing here in any case is:
. What level of openSUSE are you using? How can we guess?
. What is the exact yast2 command you gave? How ca we find out where you may have made a mistake when we do not see anything?
And something that is not easy to find here, thus we explain it to all newcomers: we like computer text you post to be posted between CODE tags: http://forums.opensuse.org/english/information-new-users/advanced-how-faq-read-only/451526-posting-code-tags-guide.html
And when you post in this way it is best to include the prompt, the command, the output and the new prompt, thus we can see what happened in full extent.