Hi,
I am sorry, I full not understand you.
In Book library - admin add all books at backend.
He do that from administrator->component->bookLibrary->books - menu
After book added and published - any user can see it from frontend.
For show books at frontend - administrator must create menu for frontend in Joomla admin part.
For create menu for frontend to book library, admin need go:
administrator->Menus->main_menu and there are press "NEW" and create menu items to Book Library
After that every on yours site - will see books from BookLibrary.
In pro version Admin - also can permit "add books" from frontend for some users groups
Thanks,
OrdaSoft team