Admins have the same creative control as the site owner, except that they can't make the initial publish or delete the site.
Authors have privileges similar to the admins, but can only edit the pages they have access to.
Developers are third party visitors who have the same privilege as an admin. They do not need to be a part of your organization.
Guests are third party visitors who have the same privilege as an author. They do not need to be a part of your organization.
Select this option to change access permission between author and admin.
Select this option to update the contributor's nickname and blog URL.