How do I give the authors of a group blog anonymity when they post?

In order to give the authors of a group blog some anonymity you will need to modify your "Template" files. Your students will also need to give themselves a "nickname" in the "Edit Your Profile" section of the blog administration pages (off of the Main Menu). For example, to display the student's chosen nickname rather than his/her Internet ID on the blog home page, in the Main Index Template find the section that starts:

" <div class="posted">Posted by <$MTEntryAuthor$> at "

Replace this in the Main Index Template with:

" <div class="posted">Posted by
<MTIfNonEmpty tag="MTEntryAuthorNickname">
<$MTEntryAuthorNickname$>
</MTIfNonEmpty>
<MTIfEmpty var="EntryAuthorNickname">
<$MTEntryAuthor$>
</MTIfEmpty> at "

Of course, this will only change the Main Index. If you want to give your students anonymity throughout the whole site, this process will have to be repeated on the Category Template, the Individual Entry Template, and the Date based Template.