See this document from HP:
In the Send a Fax section you can find the steps for sending fax messages both from the ADF and the flatbed scanner. After you load a document you hit the fax button. Then you type the phone number and hit start black or start color to fax.
Disable Fax reports:
1. Navigate to Ready Screen > Fax Menu > Fax Reports
2. Select the report you wish to modify
3. Make your desired changes
The one you mentioned here is the fax confirmation report.