If you have a Picasa account and want to delete a picture from your backup, follow these steps:

  1. Log in to Picasa.
  2. Click on the “Pictures” tab.
  3. Scroll down and click on the “Delete” button.
  4. Enter the following information into the “Delete Picture” field: a) Your name (optional) b) The picture’s filename (without extension) c) The date and time it was taken (optional) d) Your email address (optional)