Robert,
Not in front of a system now but lets see if I can describe it to you.
In the effect controls there should be a Source layer well. the well looks like a frame of film with a question mark in the center.
Simply drag the source material to this area and you will see it populate with the source video.
Let me know if this helps or if you need any more help, if you still can’t find the “well” I can post up some screen shots on Monday or arrange a phone call.
-Matt