BuddyPress.org

Probably in index.php if your Dashboard >> Settings >> Reading option is set to “Your Latest Posts”. Now keep in mind that if you add in the activity stream loop that it’ll either display above all of your blog posts or below them. Either way it’ll be really annoying.

So personally I would recommend creating a brand new page template called “Activity” that has the activity loop inside it instead of the normal post loop and then creating an empty page with the new “Activity” page template. Then back inside Dashboard >> Settings >> Reading set “Front Page” to whatever you titled your new page that uses the “Activity” page template that you created.