Barbi at RelaX BabeY left a comment on a post on this blog about removing the nofollow/ noindex tags from Blogger. I had written a post about this on Advertising for Success blog, so I just wanted to direct your attention to that post.
You can remove the nofollow code. It will make the comments on the actual post pages (where each post is on a page by itself) follow. You have to expand all widgets in your Blogger template and manually remove the code. Adding index and follow metatags will not remove the tags from within your template.
For more information, see this post: Do Follow and New Blogger