How do I generate an invoice in PDF format?

The following page shows how to generate an invoice in PDF format using invoicefu. Foremost, you need to sign in the application. Once logged, click the 'INVOICES' button of the header menu to access your invoice's list. You can generate an invoice in PDF format directly from this list by clicking the PDF icon, as shown below.

Note: the PDF icon is also accessible from the invoice detailed view.