It should have a standart USB port (like flash memory cards, mouses, HDDs etc).
I know some keyboards have a circle-kinda port. These keyboards cannot be used with Wii.
I have a standart Logitech keyboard. It has that circle-kinda port adapter too.
Lol wut?
I USE my keyboard on Wii to surf on net.
I also use it with my laptop.
WHAT I NEED TO DO TO PROVE IT?!
If you cannot plug it in, it's your problem.