how do you put your downloaded ds game into you ds and make it work?

First you have to download the roms. I would recommend you to get them from www.romulation.net ( you have to sign up first, but its easy and free. When the the download things pops up save it as desktop. Once its completed you will have the game in you desktop but you will have to unzip it, use winrar or ultimate zip, you can get them at google.

Right click on the game extract the file and another folder should come up. Open you removal disk thats the usb and drag and drop the file into the removable disk.

it doesnt matter ok look...um...if u have a ttds then it will look like this

X:<--memory stick

then these things ttds menu etc the system files it doesnt matter where u put the games the card will sense them no matter what