Well had this modem for awhile now. 

But ever since i been trying to forward some ports to certain PC's it won't let me add them to the list

Tried 3 different browsers

Tried it on 3 PCS ( Laptop and 2 Desktops )

I fill in the information that is required and the "ADD" Button doesn't come up to allow it to the list

Nothing is in the list at the moment

I have forwarded ports in the past no sweat, i just can't understand why now?

Made static IP's for each PC still nothing ... outta ideas here, Google doesn't provide much hope ( i know these are newish modems for NZ as well )