There are 4 levels of user access automatically created in the diary when a diary is first built, Click on each of the below to view the access rights:

You can create your own level of group access and tailor the administrator privileges the access allows.

How to create a new group-level access - user management

To create the new group-level access go to settings - security and user permissions - groups - create group:

Give the group level a name and description and tick the boxes you want the group level to have. There are two tabs to complete administrator privileges and menu items....remember and save at the foot of the page!