hello JoeTheOptimist, a ssid is an identifying piece of information that a wifi access point is sending out - you cannot change that unless you're in control of the hardware. in which context are you receiving this error message?

I'm receiving this message as administrator

First, let's address the biggest issue, the version of Firefox you are using is extremely old, out of date and insecure. Please update to Firefox 33 ASAP (Update Firefox to the latest release)

After that, please give a bit more context on what exactly is going on. Keep in mind this is a Firefox support forum, we can't help you with Windows settings or setting up wireless networks.