How do I set up fax on the HP Envy Photo 7800?

You can set up fax using the HP printer software (recommended) or the printer control panel. For Windows users, use the Fax Wizard during software installation or open the printer software and go to the Fax tab to select Fax Setup Wizard. For OS X and macOS users, use Basic Fax Settings from the HP Utility after installation. From the control panel, touch Fax on the Home screen, swipe to scroll down the menu, and then touch Setup.