There are 2 players on this page. If you click the top player and then the previous broadcast file cabinet icon you will see thumbnails of about 50 classes. In the lower player there are over 50 classes that can be searched by teacher with the category pulldown. If there is a temporary black screen and the video stops playing roll over the player and hit the Headset / Audio icon twice.
Below is a list where you can search archives. Roll over to see scroll bar. Pull down the category list to see specific teachers.