Quickly learn how to make an audio call from Lync 2013 by watching this short video. More details are available in the Help article Make and receive a Lync audio call.
You might also be interested in the article Make or receive a Lync video call.
Other videos to help you get familiar with Lync
Find even more videos in the Set up; Presence, IM, and Contacts, Make Audio and Video Calls; and Schedule, Join, and Conduct Lync Meetings trainings at Training courses for Lync 2013.