When you click 'Print' link you'll see the following window.

 

 

You can set options for this printout like the amount to shrink or expand the image in the printout, printing the current date and time, the user's name, the image file name, etc.  Then click <Print>

 

To change the default settings for the program so they will be set the way you like everytime you print something just do the following:

 

1. Click File..Preferences, then Program.  The following window will appear.

 

 

2. Move the slider bar to the desired image size.  The maximum printout size is 1000% of the original image size.