Here's how to cancel a job that you've already sent to the printer.
Click on the printer icon on your dock. A window will open showing your print job. Click . If you want to delete the job, click the icon.

Double-click on the printer icon in the right hand corner of the taskbar (next to the computer date) or open the window from the menu and double-click your printer's icon. In the printer window, select the document that you want to stop.

From the menu, click if you want to stop it temporarily, or if you want to delete the print job.
See also: