BuddyPress.org

I want to limit the number of items shown in the activity feed. i’ve seen other posts that refer to editing activity-loop.php (http://buddypress.org/support/topic/resolved-how-to-limit-personal-activity-feed-posts/). In my Buddypress folder I can only find files with names like bp-activity-actions.php & bp-activity-admin.php.

Is activity-loop.php hiding somewhere else or is it one of these bp-activity files that needs to be edited?

Help needed and welcome!
JohnT