Defining custom paper sizes
To define a custom paper size, click the Paper button in the Page Setup dialog box. You see the following dialog box:
Click New to create a new paper size. Enter a new name for the paper size in the New Paper Size box. Then enter the correct values in the Width and Height boxes. Click Inches or cm (centimeters) to change the measurement units, if necessary. Click OK to save the new paper size and return to the Page Setup dialog box.
Installing and Using the Macintosh Printer Software