How to create App Key for Desktop batch

Hi,I want to automatically download a list of domestic investment trusts list everyday using task scheduler.

So I am reading Example.DataLibrary.Python step by step.

https://github.com/LSEG-API-Samples/Example.DataLibrary.Python

I downloaded config.json.

https://github.com/LSEG-API-Samples/Example.DataLibrary.Python/blob/main/Configuration/refinitiv-data.config.json

but I don't know what is APP KEY.

"platform": {

"rdp": {

"app-key": "YOUR APP KEY GOES HERE!",

"username": "YOUR RDP LOGIN OR MACHINE GOES HERE!",

"password": "YOUR RDP PASSWORD GOES HERE!"

},

I opened App Key Generator Page, but I can't understand how to create any key.

I would like to know how to create App key for desktop in detail.

thank you.