Nintendo DSi & Nintendo DSi XL - Getting Connected Online - At Home with a High-Speed Internet Connection and Wireless Router - Using WPS
Wi-Fi Protected Setup (WPS)
If you have a WPS-compatible router, use the following steps to connect your Nintendo DSi/Nintendo DSi XL online:
Turn on your system and access your system settings by clicking on the wrench icon.
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Scroll over to the third page, and select "Internet."
Now choose "Connection Settings."

Click on "Advanced Setup"

Choose one of the open connection files:

Now, choose W-Fi Protected Setup.

Depending on how you want to connect, select "Push Button Connection" or "PIN Connection"

Push Button Connection: Press and hold the WPS button on your WPS router until the wireless indicator LED blinks. It may take up to several minutes to complete.
Pin Connection: Take the randomly generated 8 digit PIN from your system and enter this into the WPS security section of your wireless router, then hit "Next" to finish the setup.