The Print option on the File menu on the main Menu Bar can be used to print the current image in the Display Area. Before printing, you should select a DPI (dots per inch) setting from the Page Setup cascading menu under the File menu. Available options include 100, 150, and 300 DPI. The higher the DPI the better quality the printed image will have but the longer it will take to print.
On Windows, after you select the Print option a Windows dialog will pop up to select the printer. On Linux / Unix a file saving dialog will pop up allowing you to specify the location and name of a postscript file into which the image will be written. On Linux / Unix you will have to send this image to the printer.