How do I add scrolling text to my page?
You’ll need to provide more information. Web pages taller than the viewport scroll by default. Do you mean a box with content in it that scrolls?
See http://www.felgall.com/jstip109.htm for a marquee script that allows you to have one or more lines of text or images continuously scrolling horizontally (with optional buttons for starting and stopping them).
See http://www.felgall.com/jstip111.htm if you want the content to scroll up the screen instead.
If neither of those is what you meant then you’ll need to provide more information on just what it is you are looking for.