How do I delete material in 'Video' in the imovie app When I open imovie there are three choices Video Projects of Theater.  I want to delete what is in the video file but can't work out how to do this as when I enter this there are all the video clips but no menu to do anything but view them.  Can anybody help please.
The videos in the "Video" section can be deleted from the "Photos" application.  iMovie can include those videos when making a project, but, it cannot delete them directly.