Can't assign CC# value to fader in Axiom Air 49 using Cubase

Can’t assign CC# value to fader in Axiom Air 49 using Cubase and Kontakt 5 using Wavelore Pedal Steel Guitar. After hitting edit, choosing fader 3 and hitting the Assign Param key, bringing up the MIDI CC# -> on the display, I can’t get passed this point. The arrows don’t work to select the sub parameter so that I can assign MIDI CC# 4 for this fader to control. I have read the manual on how to do this 10 times and I can’t get passed this point. Something is either wrong in the instructions or the keyboard is malfunctioning. Can somebody please help me? I don’t know if this is a Cubase problem, Axiom problem, Kontakt problem or Wavelore problem. I am frustrated. All I want to do is assign CC# 4 to fader 3 so that I can control the keyswitches for the Wavelore Pedal Steel Guitar through the fader and not have to hit the keys to do this.

Thank you for your help.