I think it's almost working! awesome!
I typed /addbadword test test
And now I get this message in mIRC when I type "tést" in twitch chat:
* /ban: must be an op on #mychannelname (line 3, test.ini)
And my last question, how do I check what words I added and how to I remove / edit those words?

Thank you very much for helping me out, and for your patience. I know I am kind of annoying how stupid I am.