Select one of the following options from the MAC Filter mode dropdown menu.
Black List (Block all devices in list)
White List (Allow only devices in list)
After selecting an option above, enter the device name and MAC address then click Add.
The device name and MAC Address fields are present if None is selected.
The image below is an example of adding a device to the White List.
Click Save (located at the bottom).
The save option only appears after a change is made.