If you try to edit a scene but find out you can't (like you try to add a picture of whatever), chances are that's because it's locked. A locked scene has very limited editing capabilities. You can change the basic information, but you cannot add pictures, characters or categories. You can move pics up or down, and that's it.
If you want to make a modification, post the request in this thread, or send me an e-mail. Just post the scene name, or scene number.