Post a pic of the balancer and I could probably tell you the calibration steps. Most Hunter machines are the same when it comes to calibration.
Most are like this:
Set to Calibration/test. Drop the hood. When the spindle stops, raise the hood and screw the calibration weight on the inside (left) spindle plate, and rotate to the 12:00 position. Hit the "enter" (or equivalent) button. Drop the hood. Raise the hood when the spindle stops. Unscrew the calibration weight. Screw it back into the same hole on the outside (right) of the spindle plate. Drop the hood. When it stops, it should say "Cal ready."
Your Hunter rep should have the calibration weights. And nearly all Hunter balancers use the same weights.