How do I setup port forwarding for Remote Desktop Connection on the nighhawk m1?

Hi All,

I'm using a Netgear Nighthawk m1 for 4g broadband because ADSL just doesn't work in my area. I've managed to setup Port Forwarding for Remote Desktop Connection under an ADSL connection very easily in the past but I'm finding it much more difficult under 4g broadband. I've updated the APN details on my nighthawk from Telstra so I was able to get a public IP address but I can't seem to understand why it doesn't work when I try to port forward for RDC, I think I'm missing a step or something, can someone please help?