Hi Eleda,
The reason you could not hear sound for the live class is because the audio portion and Q & A session are conducted via teleconference. As soon as you entered the meeting, a pop up window should have appeared with instructions on how to join the teleconference.
For assistance with your listing and profiles questions, please file a support case using the appropriate link on our help page:
http://www.auctiva.com/free_auction_software_help/help.aspx
-Mike