To delete images in your own post, at the bottom right is an "Edit" button, choose full edit, then in the bottom right corner (again) is "Manage current attachment", click on the red x to delete it. Then submit the modified post. It will post it without the attached file (jpeg, mov, avi etc..)
As for the films, I think you'd have to contact ssappington for the file, or contact the artist directly for permission.
Hope that helps.