Want to underline some text in your post? It is very easy.
However, to do this, you must use the EDIT HTML mode and not the COMPOSE mode. You will need to do what they call Inline CSS (Cascading Style Sheet) which is CSS inside a HTML element. However, don't get frightened off by the technical jargon as you need not know what I mean by the above. All you have to do is to examine the HTML I used to display It is very easy inside the scroll box below and just copy what I do: