Hi
First you need to set up one tray. Just open and close the tray you want to print the faxes from. Set a color to that paper, for instance yellow.
Then Login as System Administrator at the control panel.
At the control panel touch screen, touch Device, then touch Tools
Touch App Settings > Fax App > incoming fax defaults > Paper settings > Select manual and then set paper color you have chosen in the first step. (yellow)
Hope this helps