Instructions
Turn on your Nintendo DS. Touch ̶0;Options.̶1;
Select the ̶0;System Information̶1; tab to find your DS̵7;s MAC address. Write this number down or keep the DS close by.
Open your router̵7;s administrator panel. You can do this by entering the default address for the router into your Web browser. Consult the router̵7;s user manual for exact instructions and the address.
Find the ̶0;MAC Filter̶1; setting. You will likely locate it under a ̶0;Wireless̶1; settings tab.
Enable MAC filtering and click the option that allows you to permit specific devices to connect to the network.
Enter the Nintendo DS̵7;s MAC address into the allowed devices section. Save your settings.
Connect to the network with your Nintendo DS. After it is cleared through MAC filtering, the gray lock will disappear.