okay i just bought a dsi and i want to go to the dsi shop but it wont let me.please help me.
It has to be a wireless router, but your best bet is to go to Customer Service:

http://www.nintendo.com/consumer/

Nintendo DSi - Connecting Online - http://www.nintendo.com/consumer/systems/dsi/en_na/online.jsp

I called them and got my sister's Wii set up and working on the Internet in just a few minutes.

Ron
Do you have WiFi at home? If so, you need to connect to your wireless router first.