You can print a document or envelope using a printer set up to work with your iPad. To learn about setting up a printer, see the instructions in the user guide for your device, or see the Apple Support article About AirPrint.
Go to the Pages app 
on your iPad.
Open the document you want to print, tap 
in the toolbar, then tap Print.
If the document has smart annotations, comments, or page backgrounds, select whether to include them in the printed document.
If no printer is selected, tap Printer.
Your device automatically searches for any nearby AirPrint printers. Tap a printer in the list to select it.
Set the page range, number of copies, and so on, then tap Print at the top of the printer options.
You can use the envelope templates in Pages to print standard-sized envelopes.
Go to the Pages app on your iPad.
In the document manager, tap Choose a Template.
Scroll down to the Envelopes section, then tap an envelope template.
Tap the placeholder text in the recipient address, then type your contact’s address.
You can add or delete lines as needed.
Double-tap text in the return address, then type your address.
The return address is a text box. Drag the handles if you want to resize it.
Tap the document’s name in the toolbar, then tap Print.
If no printer is selected, tap Printer.
Your device automatically searches for any nearby AirPrint printers. Tap a printer in the list to select it.
Tap Print.