Cannot Change MAC Address Prease Help

So I've been told im getting banned cause flagged MAC address, thought okay I can use xebuild to change that, then someone told me i had to change my network mac address, well ok how the **** do i do that in a netgear router, the steps they told me sounded very simple, but i did not have those options, not could i find them, i found an option saying use this mac address, but when i change a single value it will not connect to the internet, als under my console setting in network where it shows...

Cannot Change MAC Address Prease Help