I have read many blogs about how to make blogger comments dofollow but I found nothing good. Each blog has the information about edit template and let me clear one thing here there is no icon of expand widget in template editor but I could remove the nofollow tag from comment script as told in various posts. But what I got is nothing surprising to me because I know there is no method available for making comments dofollow until you own your own domain name for your blog. So be careful from these scam posts.