In order to use this you must download the firefox web driver and put it somewhere in your path. You can find the driver here. https://github.com/mozilla/geckodriver/releases
You will also need to install selenium with pip
pip3 install selenium
Once you have that in your path and you have installed selenium and you answer its questions you should be able to let it run.
I got bored of applying to jobs so I wrote a program to do it for you. It simply asks for your username, password, work experience level, and filters in a text file and then references them wen looking through sites. I might slow it down so that Linkedin does not become suspicious, but right now I think it works.
Things that will help. Set your career interests in your linkedin account. It will make it a lot easier to find the right jobs for you.