Print From Your Computer : Macintosh Printing (Mac OS X 10.5 or 10.6)

Select Page Setup Options
Depending on your application, you may be able to select the paper size and orientation settings, and adjust the size of your printed document or photo, from the Print window.
If you don’t see these settings in the Print window, check for them in your application before printing. For example, you may be able to open the File menu and select Page Setup.
Select the Paper Size setting for the paper you loaded.
If you want to print a borderless photo, select the paper size with a Sheet Feeder - Borderless option.
For borderless photos, make sure you loaded a compatible borderless paper size and type.
Paper size settings
You can load paper in these sizes and select the size in the printer software. A custom option is also available so you can create a custom size.
A4 (8.3 × 11.7 inches)
Letter (8.5 × 11 inches), including Borderless
Legal (8.5 × 14 inches)
4 × 6 inches, including Borderless
5 × 7 inches, including Borderless
8 × 10 inches, including Borderless
Envelope #10 (4 1/8 × 9 1/2 inches)
The Scale setting may not appear in the Print window with some applications, so check for it in your application before printing. You can also adjust the scale by selecting Paper Handling from the pop-up menu. Select Scale to fit paper size, and then select any other scaling options.
When you’re finished, you’re ready to print.