Port forwarding and DDNS on B315s-936

I have been on the Telkom uncapped LTE deal now for about a month, and so far I have been very happy with my speeds.
I pointed the antenna in the direction I believed the mast to be, and it seems to be about the best I can get.
DL : 35Mbps (I get about 2-2.2MBps)
UP : 5-7Mbps
Ping : 40-50ms
Distance to mast : 1.5km with trees in the way

But I digress...!

The router I received is the B315s-936 variant. Previously I was on an ADSL 4 meg line with an NVR attached, and the router allowed me to set up DDNS using No-IP to view my cameras at home. However, shortly before going onto the LTE deal, some lightning took out the ADSL port on the router (the wifi/Ethernet side of it still worked fine).
Now with this new router (the B315), I can't choose any other provider except DynDNS on the drop-down in DDNS setup. Unfortunately the difference between DynDNS and No-Ip is one is free, the other is about $40 per annum.

Another option would be to port forward, but I can't find this functionality in the setting either!

Can someone possibly help me? First (easiest) option would be how to add No-Ip to the drop down, the second would be how to port forward.

Thank you.