Sadly, I cannot get my DS to connect to the internet, and yes, I have tried going to nintendowifi.com.

It should work if you enter the WEP key. Or, maybe, you're too far from your wireless router when you try to connect. You will only need to enter a WEP key if your wireless router has a red lock beside it when it shows up on your DS. But you really need to give more information, as Krisp said.
And just one thing. You can't use smilies in topic titles.

Do you even have a router?

-Superbird