Oki MC561MFP User Manual page 50

2 Press the down arrow key repetitively to scroll to [Paper Setup]
and press <OK>.
3 Press the down arrow key repetitively to scroll to the tray in
which you loaded media, then press <OK>.
4 Press the down arrow key repetitively to scroll to [Custom], then
press <OK>.
5 Enter the value for the width using the keypad.
6 Press the right arrow key to move to the Length box.
7 Enter the value for the length using the keypad, then press
<OK>.
8 Press the left arrow key repetitively to back out to the main
screen.
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Print Media
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MC361/MC561 Basic User's Guide