Unless you have an Organization account, there is currently no way to add someone else as an editor on a book, sorry about that.
Related Article: How do I add a co-author to a Leanpub book?
How You Can Let Someone Edit Your Book
For now, the only ways to do this are the following choices:
1. Add a coauthor account with 0% royalties, let them edit and make previews, then remove them later.
2. If your book is in the GitHub writing mode, have them edit the GitHub repo without giving them book access on Leanpub. You could set up webhooks to do auto-previews.
3. If your book is in the Dropbox writing mode, share the book folder with them.
We do not recommend giving someone else access to your Leanpub account so they can edit your book.
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