Ik zie zojuist dat je geen DS maar een DSi blijkt te hebben.
Ik weet daar zelf niet veel van, maar ik citeer even wat ik vond:
I just got the DSi, and when I was trying to connect to my WPA network manually, it only gave the security option of WEP. How do I connect to a WPA network manually?
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I was kind of confused too. They didn't make it very intuitive.
Go to System Settings>>Internet>>Connection Settings>>Advanced Setup
It will show Connection 4, 5, 6. Click on one of the connections, search for access points, select your access point, and type in your WPA key.
Basically Connection 1,2,3 is reserved for WEP and 4,5,6 is for WPA. Hope that helps.
Tijs.