Are you using blogger or wordpress? For blogger, you need to delete nofollow tag from the html. For wordpress, you can use commentluv
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sure i'll help - don't do it. it's not very effective, it looks spammy and such comments usually get rejected.
Wordpress also has a dofollow plugin. It is called "dofollow". Imagine that. Here is a link: http://wordpress.org/extend/plugins/sem-dofollow/
Well, you can always go to my blog and submit a relevant comments I'll definitely approve comments which are reasonable.
Just open your favorite search engine and type in: “Comments links could be nofollow free†+ keyword . You will get dofollow blog lists related to your keyword