You need to open the Control Panel and choose the View Devices and Printers link found below the Hardware and Sound heading. Now, Right-click the printer icon and choose Printer Properties from the pop-up menu. Click the Sharing tab and choose the option Share This Printer. Lastly click OK to share the printer.
To find out your printer's IP address first you go to Control Panel > Devices and Printers. Then right-click on the printer, select Properties and Web Services tab. Lastly make a note of the IP address in the Troubleshooting section.