BuddyPress.org

Look in members/index.php but make your changes in a child theme (if not sure what a child theme is please check the docs codex of this site for guidance)

How to write this is another matter are you talking about simply adding some markup? then you use elements as you need them firstly ‘p’ elements then a div if necessary to group the paragraphs, more than that it’s not really possible to tell you without more detail.