@Tchentcho
Fax is one of the subjects covered in detail in your printer's website support pages.
In particular, read about the Fax feature on your printer in your printer category Manuals > User Guide
General help here:
HP Printers and Fax Machines - How to Fax
HP Printers - Improving Fax Quality
HP Printers and Fax Machines - Fax Error Code Descriptions
HP Printers and Fax Machines - Resolving Fax Problems
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 the Print and Scan Doctor (Windows), Warranty Check, HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, Manuals >> User Guide , Product Information (Specifications), more
When the website support page opens, Select (as available) a Category > Topic > Subtopic
Open Support Home
Enter the name of your HP device
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Dragon-Fur