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Hmmm, I see no edit here either. I misspelled flicker, needs to be flickr.

And I also forgot to mention that in order for you to find the "preview post" button you have to make sure you use "Go...

I don't think you can delete your posts because it's an official contest. But I'm sure that you can still try again, after all you never actually posted any pictures. I'm sure they will forgive you...