File > Page Setup
Ctrl/Cmd Shft P
6.0, 7.0, CS, CS2
The Page Setup dialog, in conjunction with the Print and the Print Multiple Photos dialogs, controls all the printing options from Photoshop.
Here you can change the orientation of the paper that you are printing on – Portrait is vertical and Landscape is horizontal (1).
Page Setup also provides options to input values for the paper Size (2) and paper Source (3), which are both determined by the printer that is currently selected. ...