How to use tasmota for KC868-A16 via PCF8574 IIC extend GPIO

[Als Santa]

Good day everyone, I am new to Kincony pcbs, I bought 2 boards but they are still on the way, to familiarize myself with my automation I installed the Tasmota BIN file firmware for KC868-A16r on an ESP32 and followed the indicated instructions. I have tried several ways but I can't get the result of seeing or configuring the PCF8574 as it is in the images.

Also support me in the YouTube video:
https://www.youtube.com/watch?v=8NqOW0HJ...KinConyIoT

Lesson29- Tasmota for KC868-A8 by PCF8574 relay and monitor sensor
https://www.youtube.com/watch?v=WCHLYGHK...KinConyIoT


And even on the github page: 
https://tasmota.github.io/docs/PCF8574/ 
https://templates.blakadder.com/kincony_KC868-A16.html

But I still can't.

Could you give me a step by step?
or guide me in what I have failed?

Thank you so much