To add on to what NIGHTFIRE5 said, you should be able to access the regular DS settings from within any WiFi compatible DS game, and I think from the DSi's system settings as well. As stated though, there are two sets of connections for the DSi: the DSi and DS connections. I suggest trying to access and adjust the WiFi settings from within Animal Crossing: Wild World, so that you know for sure that you're adjusting the DS settings. If you've set up DS settings successfully and are still getting some sort of error, there may be more at play here.
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