Here's where you can find the information you need for using your group website and user's blog.
Mac OS X's web services for groups allows your group to collaborate online. Each group has its own shared calendar, a blog for date-sensitive information, a wiki for reference information, and a mailing list archive that displays all mail messages sent to the group.
Web services for individuals allow each user who has an account on the server to create their own blog, where they can keep an online journal or other information for others to browse.
To quickly find a help topic: