First off, you must have an apple device that supports AirPrint to print invoices. If you do, awesome! Follow the instructions below to print out your invoices:

• Swipe over to Home and tap the Invoices icon
• Select the invoice to be printed
• Tap More Options to reveal the Print PDF option and tap that
• The app asks you to confirm if you would like to download the PDF from the server. Please accept that
• Once the PDF is downloaded, select the printer, the range and the number of copies that you need
• Tap Print to print out the invoice

For more information on AirPrint, please visit the iOS: AirPrint 101 page.