The step of exporting your library will most probably be done just once. Once your libraries are exported and distributed correctly, you can control all aspects of the library through the backend. Under the Manage tab, click on the Hosted Libraries item in the left column. Select your library from the dropdown list. 

Click on Export in the left column under Hosted Libraries. You will find the page divided into different tabs, with the default selection set to Export web app. You will immediately see the URL to the online (web) version of your library. Click on it to see your library inside your web browser.

The rest of the options on this screen allow you to choose the different platforms to export to. Libraries may be exported to 4 different formats: web apps, desktop apps, mobile apps, and SCORM components. Please refer to the section on Exporting your ebook to follow the similar steps with full explanation.