As of March 2014, this "virtual lecture hall" is a Blackboard Collaborate room, not a Wimba room. Now, when you click on the link above, enter your name, and click on Log in, a popup message will appear. The selection on that popup window should default to "Open with Java...". If that option is not the default option, please select it. Click on OK. If you don't have Java on your computer, you will be given an opportunity to download it.
You will need speakers on your PC or laptop and a microphone, if you want to speak directly to the presenters. If you don't have a microphone, you will be able to enter your questions and comments in a chat box. Headsets are ideal but not required. Alternatively, you can access the presentation via a telephone number. Once you're in the room, click on the telephone icon to find the phone number to dial and the PIN number to enter.