Usually, simply switching from Mic & Speakers to Telephone (or vice versa) in the GoToWebinar panel will resolve all audio issues on your end.

If you are still having issues, please visit GoTo Webinar's Audio Fast Help site.  You'll find many helpful answers to common issues such as:

So sorry, but there here are no tranfers, cancellations or refunds if you are not able to attend, but you are welcome to give your unique login to someone else for the webinar you registered for.