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Select that, in the printing settings in your application, as the Paper Size
Also select that, in the printer's driver settings, as the Paper Source or Paper Size or both.
And, load that size of paper into a tray in your printer.
(For instructions in greater detail, tell me what you have already done, and also what sort of computer you have, a Windows PC, or an Apple computer.
Fit-To-Page is a setting that can help with fitting a printout to a given size of blank paper stock.
If you are printing from a web page, brought up to view in a web browser program (like Internet Explorer), be warned that they are not usually made for printing, so printouts from a browser program may come out any-which-ways.
Though I do know the printer you are using, it helps to know what computer it is being printed to, since the printing settings can be quite different in many details, from one type of computer to the next.
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