If you have installed wordpress freshly on your blog then it is a No-Follow from the start.

If you want people who comment on your blog to get indexed then there are two ways to make your blog into a Do-Follow Blog.

1) Upgrading with a Plugin

Download dofollow.php.txt, Rename it to dofollow.php from dofollow.php.txt, Upload it in your wp-contents/plugins directory and then login to your wp-admin and go to plugin settings page and enable this plugin

2) Upgrading Manually

Upgrading manually is risky, I am not responsible if there is any harm caused to your blog. Make a backup of your blog and try this.

In “wp-includes/comment-template.php” search for the line

$return = “<a href=’$url’ rel=’external nofollow’>$author</a>”;

and replace it with this:

$return = “<a href=’$url’ rel=’external’>$author</a>”;

Done, Your blogs a Do-Follow now, Even my Blog is a Do-Follow, So keep commenting

Thanks, Apoorv