Need Help! Helical output I,J,K

Hi, Please can someone help? I have very little knowledge of onecnc XR4 but am trying to get I,J and K output for helical milling (Threadmilling) on an Acromatic 850 controller but am unable to specify the K when outputting. I,J and R or I,J and Z I can do but the machine says no! Can anyone advise how to get I,J and K please?

Thanks