For edublogs, they do not give you the ******** plugin same as wordpress. I will try the google approach now. ThanksAt first glance it appears to be WP based blogs, so you will want to use a free ******** plugin (of which there are many) as comments are by default nofollow.
Of course not familiar with them so who knows if you are allowed to use plugins, if not try Google for a tutorial as you can manually make comments ******** somehow but not sure how as I always went the plugin route.