For your convenience, adding multiple authors or administrators can speed up your library growth. Under the Manage tab, click on the Hosted Libraries item in the left column. Select your library from the dropdown list. For library management, you will spend most of your time on this part of Kotobee Author.
Click on Admins in the left column, under Hosted Libraries. From this screen you will be able to add other fellow co-workers using their serial number. If you give him an administrator permission, he will be able to control all aspects of the library, including its settings. An author permission allows the user to only upload ebooks to the library. He will not be able to edit and delete ebooks other than his.