This plugin lets you place an Author bio with Google authorship markup on your WordPress blog as a widget.
You just need to find out the widget named 'Google Authorship Widget' on the widget page and then drag it on your sidebar where you fill it suits.
Then fill your details such as your Google+ profile url and and your Name and then save the widget. Now go to your website and look for the Subscribe Box.
Check only one option from the Add links to section. (Recommended to select Title only).