You can edit your About the Book section here:

leanpub.com/YOUR_BOOK/edit_web_page_about

...making sure to replace YOUR_BOOK with your book's unique web address.

We're sorry that isn't easier to find! We are working on a redesign that should improve things. Also, please note that the Overview page for your book shows you all the pages:

leanpub.com/YOUR_BOOK/overview
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