Motorola MT7711 User Manual page 56

Note that Parental Control is Disabled by default. You should leave it
disabled until you have set up all desired Whitelists and Blacklists. Enable
Parental Control once the Whitelist and Blacklist settings are complete.
Select Enable, and then Save.
If you need to modify the Whitelists or Blacklists, first Disable Parental
Control and Save. Then, Enable Parental Control when the changes are
complete, and Save again.
To set up either a Whitelist or a Blacklist, you will need to first find the MAC
Address of the device you want to control. On some devices, this may be
found on a label. On others, there may be a way to query the device to
display this. Check your user documentation for that device.
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