I suggest that you download the latest firmware and read the latest manual.
DynamicDNS started charging for their service, so RemoteRig started their own, free
service to replace it. You will find details in the manual.
You can however still use DynamicDNS if you have an old or paid account, just click on
the drop-down menu to bring DynamicDNS.org up on the screen.
I hope this helps.
73,
Mitch DJ0QN / K7DX