Offset Feed Horn Port Setup

Hi,

Please can someone guide me how to assign the port for the offset feed horn?

For the focus feed horn, we have the aligned feeding towards our antenna but if we need to make it offset, we need to tilt it so it makes the feeding no longer align with the antenna.

So my friend told me to use coaxial probe and assign discrete port to the probe instead of assign the conventional waveport.

But, I still got errors when using coaxial probe with the discrete port...

Can someone give me favor on this? Maybe some step-by-step tutorials...

Really appreciate any help..
Thank you.