Hello Alexprobb,
The easiest way to underline text is to go into the page editor, then switch the editor view from Visual to Text in the top right corner of the editor window. Find your text and then use the HTML tags to make it appear underlined. It would look like this:
<ul>Underline text</ul>
If you have any further questions, please let us know.
Kindest regards,
Arnel C.