To include a flash player for your audio, you will need to copy and paste this code in to your post, and paste the URL of your audio into the code twice.   See relevant screencast.

  <object type="application/x-shockwave-flash" data="http://webcastacademy.net/audioplayer.swf?src=http://webcastacademy.net/files/yourfilename.mp3" align="middle" height="18" width="125">
    <param name="movie" value="http://webcastacademy.net/audioplayer.swf?src=http://webcastacademy.net/files/yourfilename.mp3" />
  </object>