Copy the files/folders to the root of your SD, depending on your situation:
•Green and Blue for A9LH
•Green and Pink for Menuhax/Browserhax/Any other *hax.
Starting from 6.0, the "luma" folder will be created automatically.
Starting from Luma3DS 5.0, you don't need firmware.bin anymore; starting from 6.0, since NTR CFW was updated to support 11.0, firmware.bin support has been limited to booting 3.x-4.x NANDs.
To boot 3.x-4.x NANDs, you need firmware.bin from this archive.
Pick the correct folder for your device, and copy it to the luma folder