Administrators are members of the community who have the ability to edit and manage the community. Each community owner can assign administrators for their community.
Administrators: These are assigned members who has the ability to edit and manage the community settings.
Campaign Group Administrators: They are the assigned administrators for a campaign groups. These administrators will have access to all the campaigns in the particular campaign group and will be able to edit and manage those campaigns.
Campaign Administrators: They are the assigned administrators who would be able to access, edit and manage only to the campaign they are assigned to.
Please refer to the link below to learn more about administrators: http://support.ideascale.com/en/articles/682956-add-administrators-to-your-community