Ok lets say you make a folder on your desktop. Name it whatever you want to. Create a level inside there (if you open GraalEditor and save it in there you might have to reopen the file at that new folder). Also put in your images you want to have in that levels (in same folder and donīt make categories like "levels", "images", "..."). They must be in 8bit. You can do it with
Paint.net. After that you can open the images in the GraalEditor. But it will just work as long as the levels and images are in the same folder.
Hope this helped