How do I underscore,I am unfamiliar with computers?
Underscore is just another word for underlining so if you want to underline text, as some people have already said, use the shift key (the one that you use to make capital letters) hold it down and at the same time just tap the hyphen key, top right of your keyboard. Another way is to use Ctrl U on the keyboard, type your word/s, Ctrl U again to take the underlining off or if you have already typed, highlight the words by dragging your mouse over, and then pressing CtrlU.