Unable to add new port forward - stuck on "Adding Port Forward"

I've been trying to add a new port forward and it's constantly stuck on "Adding Port Forward."

I have also heard about disabling "Advanced Security," but I can't find a way to disable it. Previously, it was as simple as logging into the default gateway in my browser and going to Advanced > Port Forwarding, however, they have since changed it and made it even more stupid. The new "wifi.cox.com" site doesn't even let me click anything to navigate and I have to open a new tab each time I was to visit a different page - yes, I have tried using numerous other browsers to no avail.

Anyway, I've navigated to the "Port Forwarding" section and filled out all of the details of the port forward and I get this seemingly forever:

Any help on how to fix this would be really appreciated.