blocking access to router

manishrpvv

Broken In
I have D Link DSL-2520U router it has two ports lan port and usb port .
lan port is connected with my desktop computer , and usb port is free . now in the absence of mine my younger brother uses to connect the internet through usb port in his tablet and laptop and crossed the internet speed in one go and we get a very huge bill . please help me out to block the router so that no one can use it or i can set limit in router configuration so that after certain limit router will not work on other devices OR I can block the usb port Or I can allot the bandwidth for usb port
 
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