Begin by clicking on the module you'd like to add content to and then click "create new"

Next, click "Page"

From here there are two simple ways to add audio or video to your course content. The first is to upload a file from your computer. In the Content file click on the "insert stuff" button in the html editor.

Then click on "my computer" to browse for the audio/video file

You can also use the same "insert stuff" button to record audio/video on the spot.