GooglePlus Multi-Authorship provides a straightforward solution to properly add Google+ Authorship markup to the head of each post and page on a multi-authored site. It follows the recommended use of the rel=”author” link tag to point to a Google+ profile as described in this FAQ on Google’s official webmaster blog. It adds only the rel=”publisher” link tag on the home page, front page and archive pages It adds both the rel=”author” and rel=”publisher” on single posts and pages. The appropriate author’s Google+ profile is used for each single post and page. You can set a default Google+ profile to be used as a fallback if there’s no Google+ profile specified for an author in his WP user profile settings. For questions and support, please post them at the plugin page. I can’t provide quick help if you post your questions in the forum as I am not always in the forums.