How do I change from a USB connection to a wireless connection on Windows?
First, ensure the printer software is already installed, then navigate to the HP software via the Start menu (or All Apps on Windows 8), select the printer name, click 'Printer Setup & Software,' and then select 'Convert a USB connected printer to wireless.' Follow the on-screen instructions to complete the process. On a Mac, use HP Utility located in the Applications/Hewlett-Packard folder to change the connection to wireless. (Page 5)
From the official HP Envy 5640 E All-in-One Printer manual, page 5
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