I have a client connecting to my guest network and I would like to prevent them from having any access to the wireless network. I have the MAC address of the device, but I'm not seeing anywhere to black list it in HiveManager.
I realize I may have led you astray - I focused on firewall, which should just prevent that user from pushing traffic rather than preventing them from associating (which is what I think you want. If you go under SSID>Optional Settings>DoS prevention and Filters You will find a blacklist. You can fill in all the blacklisted devices you want there.