Game Input MultipleXer

Hallo everybody.
At first i would like to apologise if there are any misunderstandigs or bad spelling, my english is not that great.

Right now I am trying to use the GIMX software with my Windows PC (later hopefully a raspberry pi)
Sadly I know nearly nothing about microcontrollers etc.

I am trying to build the GIMX adapter eather a Arduino NANO or a Arduino Uno. I tried wiring the TXD / RXD /GND to one of the Arduinos but nothing seems to work. As far as I understand the wiring comes From the red USB adapter and goes something like:

Red USB Adapter / Arduino NANO / Arduino UNO
TXD RX0 RX0
RXD TX1 TX1
GND GND(at Power) GND (somewhere)

is this right?

Could someone please mark the pins in the Picture?

Everytime i blug in the USB adapter and the arduino (doesn't matter) wich one i try, and start to update the firmware, the program says something like:
The Programmer is not responding.

Could somebody maybe do a little step to step tutorial or something like that?
Thank you all very much!

https://ibb.co/L12431Y

Please refer this guide:

https://gimx.fr/wiki/index.php?title=DIY_USB_adapter

You will see this line:

Make sure it is working at 5V and that is has an atmega32u4 chip.

So you need an atmega32u4 chip, like pro micro or leonardo, not atmega328 like uno, nano.

ah ok, thank you very much.

I ordered a Arduino Leonardo with a 32u4 now and try again.