To print a document, click on the "File" menu and then select the "Print" submenu item. That will launch a print diaolg that allows the user to select the desired printer and other printing parameters.
Printing an FIR document will print the filter settings used to create the document on the first page, and two graphs on the second page. The first graph is the filter frequency response, and the second graph is the filter phase response.
Printing supports Letter-sized pages and Portrait mode.