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Delete the photos from your computer. Most camera software has the option of copying or moving the pictures to your computer. Moving them will free up the space on your flash card. Sometimes the software will let you delete the photos directly. If this does not work, then take the card out and find a friend with a card reader in their computer. They should be able to help you open the file on the card with the photos (often named DCIM). Then you can delete the photos just like you would delete a file. If you can find a friend with a card reader, take the card to a photo printer and beg a favor.