BuddyPress.org

‘What’ you should change sort of depends on if you are using a child theme of the BuddyPress default theme or not. There is quite a list of updates for the theme changes the members is one, ajax.php /js and functions.php is another along with some member/group/forum loop stuff. I would strongly suggest if you can getting the latest update from your theme source particularly as you say you are a novice which I take means not comfy in code?