Google has recently dropped all the Authorship functionality from search results. So, you won't be able to use it anymore. However, I'd like to brief you on Google Authorship.
With Google Authorship, introduced three years ago, Google tried to link articles with the Google Plus profiles of authors. It enabled Google to display the profile picture of the author in search results along with an option to the readers to add authors to their circles.
For this an author needed to have a Google Plus profile with a recognizable photo, his/her website mentioned in the profile and he/she should have registered for the Google Authorship service. Subsequently, the articles by the author needed to be followed by their name that matched their Google plus profile name.
This helped the articles of the author to get listed on Google search along with their name and profile photo. So one could recognize the authentic writer of the article.
The extent to which this service was helpful in fighting plagiarism, remains a debatable topic till date. Low adoption of the service along with results not matching to the expectations, led Google to wrap off this service at least for now.