OK, so you have your Blurb book done and it's all set out in Booksmart and ready to upload, what do you do next? Follow this set of slides telling you how to proceed. Make sure that you have proof read your book, check all spellings and grammar, make sure that all your pictures are in the correct order, etc, etc, etc.
Use the 'Preview Book' button to view your work as this gives a good representation of how your book will look. Make sure to take notes of any changes and use 'Edit Book' to do your corrections if necessary.
If you are happy with everything, at the end of the 'Preview Book' section is the submit button. Follow these slides and you should be fine.
Good Luck, David