Insert your DS Flashcarts SD card into your computer, and copy either the file "TB_loser_inject_EU.nds", for the EU region, or "TB_loser_inject_US.nds", for the US region, to your flashcart. Put your flashcarts SD back in your flashcart, and put your flashcart in your DS/DSLite. Start your flashcart, and run the nds file you just copied. It will be named "SaveInjector" in most flashcart menus. It will prompt you to eject your flashcart, and insert your copy of "The Biggest Loser". Do that, and press [start] on your DS/DSLite to inject the hacked save. Once it finishes, turn off your DS/DSLite and eject your copy of "The Biggest Loser", and insert it into your DSi/XL. Start the game, and after the loading screens, you will be presented with your CID, displayed on-screen, in alternating colours. Type that into another text file, and save it for later.