hehehe. Yeah it's pretty well commented in the code to explain what it's doing, just for folks like you who are curious to see how the thing works. :)
The script contains no way to kill your PC, steal your accounts or anything like that.. I keep that evil shit locked away and not publicly accessible because I don't want black hats using my code to fuck people. :P
Basically just toss your username and posting private key into the .env.example file then rename it to .env and start the beast, should be good to go. :)