Works like a regular high - lighter on a computer. Except for the fact that you can't high - light backwards. Anyways if any of don't know how to high - light, well listen closely; your put your cursor anywhere left of the word, and you click and drag it across the letters until you're satisfied, once you let go of the (left clicker?) you can't high - light again, or else it'll restart the high - light; but if you want to restart it you can click somewhere, and the highlight will be gone.... and then you can high - light again.
-me If you see any bugs make sure to tell me in the comments.