Its right here
So the guide begins by saying that you search google for a string that is something like this :site:.edu inurl:blog "post a comment" - "you must be logged in" - "comments closed"
That will get you edu blogs where you can post a comment on. Then using the seoquake plugin you can order the search results by their page rank. Then the guide talks about checking if the blog has do follow tags. Seoquake plugin has do follow feature which crosses out links that are not do follow. However when i go to the edu blog comments page there is no links posted already so I dont know if the blogs comments are do follow or not. How can I find out if the blogs comments are do follow or not?