Upload the folder google-plus-authorship to your WP plugin folder /wp-content/plugins/ directory
Go to Plugins > Plugins, and activate the plugin
Go to Wodpress Admin Panel > Users > Your Profile, and Fill up Your Google Profile URL and Your Name
Get a link back from your Google Plus Profile
Sign in your Google profile.
Click Edit profile.
Click the Contributor To section on the right, and then click Add custom link. Get a link from their. ( For the first time, add a link from description area, other profiles, contributor to, and from recommended link.
Requires: 3.0 or higher Compatible up to: 3.3.2 Last Updated: 2014-1-2 Downloads: 56,480