I don't quite get what you mean...
the code is fully hand-written

Oh, I thought you said that there was a way to edit the source code.

ah now I get it.
Depends on your browser. You might want to check out this if you're using chrome:
stackoverflow [DOT] com/questions/5258989/manually-adding-a-userscript-to-google-chrome

rest should be in the content description.

If you're referring to adding the channel skipper, don't worry about that it installed automatically :). I was just wondering about when you said that you could edit the source code so it only skips certain channels.

actually that's what I meant...
you'll need to find where the script is stored in order to edit it. that should be explained in the description pretty much, on the stackoverflow site you'll find the various user-datadir defaults for chrome.
then edit the file script.js in notepad++ or something like that