It doesn't work Rated 1 out of 5 stars

It doesn't work at all. I don't get it. I am a moderator on a website and when I write replies to people, this thing isn't underlining any of my misspellings. I've installed it twice, shut down, restarted and done everything I can think of.
I'm giving it one start only because I am required to do so. This thing deserves no stars.
It doesn't work.