Help > Adding Anyplay.fm
Anyplay.fm is a membership based site that offers a wide variety of audiobooks.
Start by clicking on the icon of the stack of Library books in your browser.
Near the bottom, notice that there is a scrollable box with a 'yellow' background. All special catalogs are found in this box.
Scroll to Anyplay.fm and click on Add Anyplay.fm to add Anyplay.fm to the Library Extension.