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
Video: Find and add contacts in Lync. This video shows you multiple ways to quickly build your Contact list in Lync.
Video: Change your picture in Lync. The picture you display in Lync can be any size and in any location.
Video: Check someone’s availability in Lync. This video takes you beyond presence indicators, showing you how to check someone’s schedule, and even tag them—all without leaving Lync.
Video: Share your desktop in Lync. You don’t need to be in a meeting to share your desktop—you can do so even from an instant message.
Find even more videos in the Set up; Presence, IM, and Contacts, Make Audio and Video Calls; and Schedule, Join, and Conduct Lync Meetings training at Training courses for Lync 2013 for Office 365.