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Log in into Router, navigate to Setup (Top) -> Wireless Settings (Left) -> Manual Wireless Setup (button)Now remove checkmarks in the Enable Wireless option (2x), Save Settings and the radio-transmitters are off...
No on the webpage of the router (http://192.168.0.1) and supply admin-name and -password. If you have not changed that setting it should be "admin" and "" (blank) [it would then be a good moment to change that password if it still is the default].