1. Type the IP 192.168.0.1 in to your web browser's address bar.
2. Enter user and password (might be admin//admin, admin//password, or admin with now password. Try a variety of combos, including the name of your ISP as your password incase they supplied your router for you).
3. Go to the DHCP section, disable DHCP, and assign each computer a valid IP address. The wizard will take you through it. Fairly straight-forward.
It sounds to me like you're just looking to simply add someone to the network, though.
In that case, just keep DHCP enabled, which will automatically assign IP addresses to everyone on the LAN. Make sure all the networking hardware and wiring for the computer you're trying to add is functioning properly, and run the connection wizard in Windows on that machine when it's hooked up.
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