Insert forum username & password, then follow buttons for your upload queue images. You can delete from there.
What can happen is that the initial info form can be processed, which also uploads the image to the anet server. If you don't complete the second form (the one with 'note to screeners') I think it just floats about until someone deletes it. I've done that once or twice by accident myself, before the photographer's corner facility was active.
It takes a big man to admit they are wrong, and I am not a big man.