If you want submit more comment at .edu site and increase your super backlink from edu site (blog edu, forum edu, wordpress edu)

visit here http://www.nadzar.com/backlink-search-engine/ and submit your keywords. for example "educations" and choice your find "ex : Blog Engine" and then choice (dot)edu. than will click

please install add ons SEOquake before execute it to find high PR from (dot)edu site

if you interest to try this, please PM password to me, (it is free, and only help you :D )

regards,