@woozle thanks for checking that. The reason I want it is to proactively prevent my child to connect to third wifi at home. With your funding, I must connect my child's machine to this wifi once, and...

Using Tether app, I click on more > Block list and add a new entry for a MAC address of a device at home to block, it seems added but if I go out of the manu and come back in, the new entry is gone....