After having installed KMK on the previous page, you're going to want to click 'Download Project Bundle' on the file below. Unzip the file, copy kb.py to your CIRCUITPY drive and rename main.py to code.py and copy it to the CIRCUITPY drive as well.
# SPDX-FileCopyrightText: 2022 Eva Herrada for Adafruit Industries # SPDX-License-Identifier: MIT import board from kmk.kmk_keyboard import KMKKeyboard as _KMKKeyboard from kmk.matrix import DiodeOrientation class KMKKeyboard(_KMKKeyboard): row_pins = (board.D5, board.D6, board.D7, board.D8, board.D9) col_pins = ( board.A1, board.A0, board.SCK, board.MISO, ) diode_orientation = DiodeOrientation.COLUMNS i2c = board.I2C
After you've copied everything over, your CIRCUITPY drive should look something like this.
At this point, the keyboard should just work when you hit the keys. Feel free to mess around with the key maps. KMK has some good documentation on this process.