sorry found it,
I'll post the answer here, just in case someone is as clumsy as I.
Sign in to your account, go to your 'Upload History' and click on 'View Images' of whichever date your image was submitted. Click on the checkbox of the selected image which you wish to delete on the right side. After selecting the checkbox, scroll down to the bottom of the page and click 'Save Changes' on the right corner. The selected image will then be removed.