How do you?

Ok tryin to download games to the memory card. I'll put it in the Ds but it doesn't reconigize anything. How do I get them to work on the Ds?

....are u talking about the memory card for the dsi? cus then you fail u need a flashcart and then you need to download the os then put them on the flashcart and put it in the ds

See the winrar tutorial in the tutorial section.