How do I delete posters from my movie's page?

I tried to add a poster to my movie's page (Abnormal Attraction) and I kept getting an error message telling me it wouldn't upload. Then it finally did upload, but the failed attempts must have not actually failed because it is up there five times. All of which are very low quality and have an incorrect credit on them. So I claimed the page with Scorecard and re-uploaded a new poster. I clicked submit, but of course nothing happens so now I don't want to keep clicking it and end up with another five posters up there.
I will wait and see if the upload works, but the real question is how do I take down the incorrect posters?