Download the thenaya.cia, install with fbi, make a folder called amiibo at the root of your sd and place your amiibo bin files in there, find the correct key file, this cannot be shared so dont ask, and place it in the root of your sd, the file should be called amiibo_keys.bin and should be 160bytes and the md5 hash is 45FD53569F5765EEF9C337BD5172F937. When you have all that, you need blank NTAG215 cards or stickers, you load the thenaya app from your 3ds and select the amiibo bin you want to write to a NTAG215 card, then select write to and place the card on the nfc reader