How to open and edit an ebook (epub file) with Sigil (free software)

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In this video series on book formatting, we've just converted from Word docx to epub and mobi using the free online ebook conversion tool at http://www.publishxpress.com. If you'd formatted everything correctly in Word first, these files should be ready to go and look great. But if you haven't - or you find typos or problems later - you'll have to open and edit the epub. Sigil is a free program you can download; this video will show you how to open an epub, and the basics of using Sigil to edit it, save it as a new file, and convert it back to mobi again. You can watch the other videos in this series here: http://www.diybookformats.com