Don't know how to open WARC file via this viewer :)

Hello! I'm a new one in these Python and Warc themes, so please be gentle.

Well, I've performed some actions, as seted out in steps 1-5: installed Python 3.6.2, tornado 4.5.2, ran the proxy and setted my browser to required parameters regarding proxy.

And what is next? How should I use this viewer? Can anyone explain me in more details?

Thank you.