Things You'll Need
Instructions
Go to the game's main menu. Select the "Nintendo WFC Settings" button.
Select the "Nintendo Wi-Fi Connection" settings function on the new screen.
Select "Connection 1." Choose "Search for an Access Point."
Select the connection you want to use. Enter the WEP key for your connection if prompted.
Select "OK" and "Save Settings." Choose "Yes" to finish.
Connection with MAC Filtering
Go to the game's main menu. Select the "Nintendo WFC Settings" button.
Select the "Options" button. Choose "System Information" in the "Options" menu.
Copy down the MAC address listed on this menu. Access your router's settings on your computer.
Add the Nintendo DS's MAC address to an empty field. Save the changes to confirm the connection.
Consult Nintendo's router list if you do not know how to access your router settings.