@Charlene5
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.
Assuming Windows
If you have not done so, install the Full Driver (printer software)
HP Easy Start Printer Setup Software
When asked to select, opt for the "Full software and drivers" (exact wording might vary).
After the software is installed, Restart your computer and log in
Next...
What to do?
Particularly if you lack experience with using the Fax (or setting up the Fax), please do read the chapter on the subject in your User Guide.
User Guide
Starting on Page 66 - Chapter 4 - Fax
More Help
Category How to > Select Topic: Fax
and
Category Troubleshooting > Select Topic: Fax
Example - Embedded Web Server - Fax - Digital Fax (Printer model dependent)
EWS_9025_Digital_Fax_Profile_2
References / Resources
Product Specifications for the HP OfficeJet Pro 9018 All-in-One Printer (1KR45A)
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, User Guides / Manuals, Product Information (Specifications), more
When the website support page opens, Select (as available) a Category > Topic > Subtopic
HP OfficeJet Pro 9018 All-in-One Printer
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