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In Image Manager, there is a link for "list". When you list the available images, there is a link for "delete" in the bottom row of the image's details table. Just click the "Delete" link then confirm by clicking the "Submit" button and the image will be gone.
HTH.
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.