Archived videos are arranged by date, with the most recent at the top of the list (View meetings from 2002-2008 here).
For live streaming, see the "In Progress" links under Upcoming Events below. "In Progress" Links will be created and visible when the meeting begins.
In the address bar, type chrome://settings/content to open the content settings screen. On the content settings screen that appears, find the Flash Player listing. Check the status. Select Allow sites to run Flash, then click Done.