Biographical Info Paragraphed is a plug-in for WordPress that allows WordPress to add additional HTML tags like p, br, rel=”author” etc. to the Biographical Info field. You can add rel = “author” to your profile using this plug-in.
Not only that. Some other html tags that may cause security problems are still blocked. So, you need not to worry using this plug-in like some other plugins out there.
No configuration is required. Just install, activate and enjoy editing your author profile.