Hi Huan,
The SocialSite blog site is still the best place to look for documentation and other announcements. Have you had a chance to look at:
http://blogs.sun.com/socialsite/entry/how_to_social_enable_your
Perhaps information from the screencast and editing the sample that's shipped with the download can help get you started.
Please feel free to leave comments on the blogs, which are regularly checked, if there is some information that's not clear or if there's more information you need.
Thanks,
Aditya
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