Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to hear that you are having such trouble. I will try my best to help you out and resolve the problem as quick as possible.
have you installed fax to use the fax function?
how is it connected to the computer is it on the usb?
Power off the printer and then you need to uninstall the already installed printer driver from the computer and then reboot computer.
Download and install the full featured driver software which includes the fax setup and you can install it and configure the fax.
Need any remote assistance let me know.
Driver download link given below.