1- Open CMD < pip install selenium > Make sure you have installed Python before.
2- Download ChromeDriver from : https://chromedriver.chromium.org/downloads to check what version of Chrome your using visi: https://www.howtogeek.com/299243/WHICH-VERSION-OF-CHROME-DO-I-HAVE/
3- locate the file (app.py) Python in CMD then run (python app.py)