IMPORTANT NOTE: the savegames in the 3DS sd card are ENCRYPTED. To make any modifications you need the unencrypted savegame (or use the 3DS version of the editor). To do either, you need to run HOMEBREW on your 3DS. As of February 13th 2017 the recomended method is SoundHax to run homebrew and JKSavemanager to get the unencrypted savegames, you will find plenty tutorials on youtube/other specialized forums that focus on homebrew. If you are on firmware 11.2 or below you may be interested in read