I'm not willing to lift a key to check, but I'm going to make a guess that they're connected a bit like a Dell - they probably aren't but I can't find a photo.
If the four bits on the key and the four bits on the switchy thing are all intact and in position, you just have to bend switchy bit whilst attaching the key. Its hard with a key thats not the edge of the board, but detaching space to get access is a bad idea
Otherwise, if they machine is in warranty, get a new keyboard. They seem to handing them out like they're going out of fashion to owners of the October 04 revision iBook....