Please take a look at the User Manual:
DMX OPERATOR PRO User Manual
Here are some things to check:
-Check DMX Polarity (page 8 User Manual)
-Check DMX cable is meant for lighting, not audio
-Make sure light fixture set to correct channel mode. DMX Operator Pro can control up to 16 channel fixtures.
-Check pan & tilt joystick assignment (page 11 User Manual)