BuddyPress.org

It should be, otherwise you won’t have seen the member Pages
– plugins/buddypress/bp-themes/bp-default/members/single/member-header.php

Copy member-header.php to your child theme following the structure yourchildtheme/members/single/member-header.php and make the change there. If you make a change in bp-default parent theme, the change will be overriden when you upgrade BuddyPress