Aha.. thanks for leading the way, Bill. Now.. to help you.. what you want to do is find the embed code for any video out there... then.. when you're posting a new discussion to the group, look for the "media" button (looks like a strip of film) in the tool bar of the editor where you are typing. It's the third button from the left. When you click it, a pop-up will come up where you can past the embed code from the video. That way.. you're video will show up and play here in your discussion stream.
I believe that was your intent. Give it a whirl.