title_body: Editing a published epub book I have tried for several hours to edit an eBook with Calibre, the page I wish to edit comes on screen but will not edit. I have read the instructions a dozen times and I cannot find an answer to what I am doing wrong.
upvoted_answer: Do you see this as in this picture when you're trying to edit an eBook?
  
  You can only edit EPUB and AZW3 formats!
  
  Here's the tutorial with pictures how to proceed when editing eBook in Calibre.
  
  As an alternative, you can use Sigil to create and/or edit EPUB format.