I am setting up a CNC 6040z-4s mill and the controls for the Z-axis stepper motor are reversed.  I went to the config->system hotkeys and selected page up for the Z++ and page down for the Z-- and they are reversed from what they should be.  I can reverse the hot keys assignments by selecting page down for Z++ and page up for Z-- but I am wondering if that is the correct way to correct this.  Is there some other method that this should be corrected.  Thank you.

Page Up for Z++ would be correct for the key.
If the Z goes DOWN when you hit this key, you can reverse the direction of travel buy changing the Active State of the Dir. pin.

Thank you, changing the active state of the directional pin did the trick.