This is going to be easier on Windows - and is likely possible braving the printer control display - and might be easily doable using the Embedded Web Server (EWS). I cannot speak for trying to set up the fax using other devices.
If you have not done so, install the Full Driver (printer software)
Printer Home Page - References and Resources –Learn about your Printer - Solve Problems
“Things that are your printer”
NOTE: Content depends on device type and Operating System
Categories: Alerts, Access to thePrint and Scan Doctor(Windows), Warranty Check, HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, User Guides / Manuals, Product Information (Specifications), more
When the website support page opens, Select (as available) aCategory>Topic >Subtopic
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