You can print an invoice in Moon Invoice easily by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. From the main menu on your left, go to Sales ➜ Invoices.
3. Open the existing invoice and select the PDF & Print Settings option. 
4. Here, you can customize how the invoice will be printed by selecting your preferred options.
5. Click Save to apply the changes.
6. Next, click the Print button and choose the desired print settings.
7. Finally, click Print to generate the invoice.