It's easy to add additional users to your account, and we recommend adding anyone who would benefit from the service. We never charge on a per-user basis.
To add an additional user, visit Account > Settings > Users > Add User. Enter the email address, name, and role of the user.
Once you've entered the user's information, click Add User, and an email will be sent to the added user with an access token so that they can set their password and complete their profile.