Add a delivery method to Opencart 2

You want to connect to the store on Opencart 2.3.0.2 a method of delivery from the https://www.zasielkovna.sk/ vendor

The actual instruction is https://drive.google.com/file/d/1086KPDsjbGg-nTuB3Mhhh16OuxMMceMI/view?usp=sharing