Share & Print Button under each Post

Hello, I've seen Share & Print Buttons (along with Facebook and Google+) at the bottom of Posts on this site: http://www.mvs-sachsenheim.de/herzliche-einladung-zum-kirchenkonzert/ I tried to figure out, how to enable these on my site - but couldn't manage it. Is this an expansion or is it included in the catch everest theme somewhere? Kind regards