Oh, you have to put the codes in yourself

First you have to enter the game ID where it says "Game ID" in the top-left corner. For NTSC-U, the ID is RSBE01, for PAL I think it's RSBP01. Then put in the game name in the next box over and click Store Name/ID. Next, you have to click "Add a Code/Comment/Category" in the bottom-left corner. Enter the code name, then click OK. Click on the code name in the box above then paste your code into the "Code Contents" box. Save it as a TXT file, then export the .gct tto your codes folder ^^