For your webcast, we recommend a great free service: Ustream http://www.ustream.tv/
Ustream gives you all the technology to record and stream your webcast and provides embed code for their feeds. Below the feed hosted by Ustream, click on the button that says Copy embed.
Then in Yola, use an HTML widget to paste the code onto your site. Instructions on how to do this are found here.
People will then be able to watch your webcast directly on your Yola site!
Please keep in mind that while the code may work now, we cannot guarantee that it will continue to work in the future. Codes can become obsolete and/or conflict with the enhancements made to provide you with the best Sitebuilder possible.