What should we add to the theme so that we can see the author thumbnail at the blog?

Hi Team,

We are thinking to use this plugin:

Is it right that users than can add that G+ profile and that there thumbnail/picture will show up in de blog results?

This is what we want:

What should we add to our theme? A specific PHP code in the blog title?
It works also for pages?

Thank you in advance for your help.