search romulation.net and type watever game u want to download in the search space on the page and click on the game on the list . then there will be a yellow square with download written in it and click on that and then click on north american server and download it but before u do that download the 40 day trial of winrar on the winrar website because when u downoad the file double click on it then highlight the game and then click extract file then choose your ds usb and then extract the file to it and then put the sd in your cartridge and power on and have fun playing(: