Navigate to the songbooks page
You should see a list of your songbooks on the left part of the screen. Click the "PDF" link below the name of the songbook you wish to download as PDF.
You should now see this screen. You can select your choice of chord images, none, guitar or ukulele.
You can also choose from a number of templates for your PDF. Click the one that suites you. You can always choose another one to re-generate your songbook in a different format.
The PDF generation takes a few seconds to complete, when that is done, you should see the PDF icon.
Click the PDF icon to download your PDF songbook.