Here are the steps for adding a co-author to a Leanpub book:

1. Ask each co-author to sign up for a Leanpub account, if they do not already have one. It is free to sign up. Here is a link to the sign up page: https://leanpub.com/sign_up.

2. Ask each co-author to provide you with their Leanpub username.

3. After you have created your book, add each co-author here:

https://leanpub.com/YOUR_BOOK/authors

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

On this page, you can use each co-author's Leanpub username to invite them to join your book.

4. Each co-author then needs to accept your invitation. They can accept the invitation here: https://leanpub.com/user_dashboard/invitations.

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