Instructions
Open the "System Settings" for your Nintendo DSi by selecting the "Wrench" icon.
Choose "Internet," located on the third page of the "System Settings" list.
Select "Connection Settings" from the "Internet" tab.
Select "None" next to the "Connection 1" box.
Select "Search for an Access Point" to instruct your Nintendo DSi to locate your ARRIS Internet connection.
Select your ARRIS wireless network name from the list of available networks.
Enter your ARRIS wireless network password if you are on a secured network.
Click "OK" once you have entered your password and then click "Save Settings."