You don't have any messages to show in your stream yet. Once you
begin participating in your courses you'll see this stream fill up
with messages from discussions, grading updates, private messages between
you and other users, etc.
In order to create video or audio recordings your computer needs to be
webcam-enabled. If you don't have a webcam on your computer, you can still
record audio-only messages by first installing the Google Video Chat
plugin.