Hi Dave
Sorry for the confusion - this is something that pops up a lot. When you access your router settings page and it says that Static IP is not active, this is the way it should show. It would only show as being active there if you had multiple Static IPs. As you only have one, it should be working fine 
If you are having issues with the Static though I would recommend you get in touch with our Technical Team here.
Regards
Ryan