You can open the Page Setup dialog from almost any application:
With a document or photo open, choose File 
 Page Setup.
The Page Setup dialog appears.

Adjust the settings.
From here  | Choose  | To  | 
Settings  | Page Attributes  | Choose a paper size, orientation, or scaling value for a photo.  | 
Save as Default  | Save customized settings as the default settings.  | |
Format for  | The name of your printer  | Format a page for printing with the printer.  | 
Paper Size  | Choose a paper size from the list.  | |
Orientation  | Choose an orientation.  | |
Scale  | Reduce or enlarge a photo to a percentage of its original size. Note: Recommended values are between 25% and 400% of the original size.  | |
These buttons are at the bottom of the Page Setup dialog:
Click  | To  | 
Go to the Help Center for more information.  | |
Cancel  | Exit the Page Setup dialog without making any changes to the settings.  | 
OK  | Save the settings and exit the Page Setup dialog.  |