BuddyPress.org

How to include “Favorit” button in a post page, for example a media page (eg. rtmedia) or a blog post page ?

I have seen that the plugin “Buddypics” does this

    				<?php do_action( 'bp_media_before_activity_meta' ); ?>	<?php if ( is_user_logged_in() ) : ?>
						<?php if ( !bp_get_activity_is_favorite() ) : ?>
							<a>" class="fav" title="<?php _e( 'Mark as Favorite', 'buddypress' ) ?>"><?php _e( 'Favorite', 'buddypress' ) ?></a>
						<?php else : ?>
							<a>" class="unfav" title="<?php _e( 'Remove Favorite', 'buddypress' ) ?>"><?php _e( 'Remove Favorite', 'buddypress' ) ?></a>
						<?php endif; ?>
					<?php endif;?>

Howevr when I do this, for example in, wp-content/plugins/buddypress-media/templates/media/media-single.php I do get the “Favorit” link/button but it is missing something

/activity/favorite//?_wpnonce=f99fe2d956
the above is supposed to be /activity/favorite/x/?_wpnonce=f99fe2d956 where x is something like 6, 7, 8 etc

I have looked up in the docs but not finding any solution.