I am gonna tell u how to block a wireless client only using ur phone( not a PC) and if the router is a dlink 192.169.1.1 router only 1, obviously u have to login first 2, select "Advanced" 3, Click and hold "Advanced wireless" then it opens another option then click " Access control" 4, Change the " wireless Access control Mode" from " disable" to "deny list" then click apply changes then wait( the connections turns off and back on again by itself in 18 seconds I guess) 5, Then click on " Status" then "wireless clients" and then write the mac address of the user u wanted to block without including the ሁለት ነጥብs on paper or sth 6, Repeat step number 2 and 3 7, Write the mac address u wrote on paper on the slot saying "mac address" then click add and wait and its done try it on ur moms or dads phone first then u can reset it if it works and use it I really hope it works....thats all I have to say