Setting up external IP address

I’m setting up my storage node and I’m stuck at this point
8) Enter your external IP address and port (:). You can find more information about how to configure this in our Port Forwarding section.

I simply don’t understand what to put in. I have a free account with NoIP. And I have set up port forwarding as per the guide.
Thank you in advance!

Use the hostname you picked from the free NO-IP account. Install the DUC from NOIP.