The document provides instructions for printing a 12x18 poster on the HP Laserjet 5550DN printer in the MHS Graphics Lab. It describes loading 12x18 heavy gloss paper into the printer tray, setting the paper size to 12x18 in the printer settings, and directs the user to another source for instructions on setting up the print job and sending it to the printer. It notes some potential issues students may encounter with sharing the printer.