Okay, so I managed to connect to the wifi, as per this guide:

http://www.nintendo.com/consumer/wfc...DS&locale=lang

checked my connection, it says it was fine, agreed to the user agreement, and then I go and try to connect my C-Gear, it gives me error code 51099. When I try to use the wifi settings the game has, it says it can't find any compatible access points, when I've checked that my DSi is connected in its settings.

Also, I had to go through advanced settings to get my DSi connected.

Help? :/