How do I invite internal (author, admins, review) users to my account?
Internal users are other users on your account that belong to you company or organization responsible for creating, managing, and publishing guides. In order to add users to the account, you need admin authority in your account space.
Navigate to the People panel.
In the “Invite Users” section, put in the email of the person that you’re inviting to the account.
Select the role and guide or guides to which you’d like them to have access.