I have been to library and unchecked 'show photos in sub folders' but am still unable to custom order. Please help!
First why would you uncheck "Show photos in sub folders"? That will stop all your images from showing.
Second there are only 12 "Sort" options available and Custom is not one of them.
Just what are you trying to accomplish? In what order do you want your images displayed?
I sorted it by having the images in a collection rather than a smart collection - but thanks for your response : )