Scroll down to see how to do this in Symphony 1.5
In Symphony 2.0:
Hover over the meeting to reveal the menu, where you can control your audio and video or end the call.
Figure 1 Meeting menu
In Symphony 1.5:
Hover over the meeting to reveal the menu, where you can control your audio and video, begin screen sharing, update your settings and leave or end the call.
Figure 1 Meeting Menu