Grandstream Networks GWN76 Series User Manual page 68

Adding Client Access List
Users can also Import/Export the client access lists in CSV format as shown below:
Import/Export the client access
Users can check « Enable Schedule » to assign a schedule for the list when it will take effect.
Adding New Access List
Once this is done, this access list can be used under SSID Wi-Fi settings to filter clients either using whitelist or blacklist mode.
Blacklist Access List