BuddyPress.org

Paste this into your Functions.php file and then edit to your liking

//Change order of Buddypress tabs

function my_change_profile_tab_order() {
	global $bp;

	$bp->bp_nav['activity']['position'] = 10;
	$bp->bp_nav['profile']['position'] = 20;
	$bp->bp_nav['courses']['position'] = 30;
	$bp->bp_nav['forums']['position'] = 40;
	$bp->bp_nav['groups']['position'] = 50;
	$bp->bp_nav['friends']['position'] = 60;
	$bp->bp_nav['notifications']['position'] = 70;
	$bp->bp_nav['messages']['position'] = 80;
}
add_action( 'bp_setup_nav', 'my_change_profile_tab_order', 999 );