For copyright reasons, the library module provided is a bare bones template only. Have you downloaded the template .mod file and placed it in the modules folder?
The modules menu is an older version. There's a book icon is the top right of the navigation bar, rather than a link in the library itself. To activate the module, double-click or left drag the book icon against the Adventurer module. The module should then appear in the library.
After that, it's a case of unzipping the .mod file and editing the common.xml inside. A lot of cut & pasting later, rezip the unzipped folder, from inside the folder making sure that the definition.xml and common.xml files are in the top folder of the zip file. Then rename to .mod and put back into the modules folder.