On the top left-hand side of the manual's page, click 
on the <span class="button">Browse</span> button and 
then select <span class="button">Advanced</span>. 
From the menu on the left-hand side of the new page 
click on the <span class="button">PDF Export</span> 
button. You can see now a hierarchical representation
of the manual's pages. Select the tickbox for the chapters or
pages that you want to export and click on the 
<span class="button">Export</span> button, at the 
top of the page. Once the process is completed 
click on the <span class="reference">here</span> link 
to view your PDF.</p>