BuddyPress.org

i’d try removing the logo something like this in your functions.php or bp-custom.php…

remove_action( ‘bp_adminbar_logo’, ‘bp_adminbar_logo’ );

…and try applying your welcome message start here & here:

https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/modifying-the-buddypress-admin-bar-not-working-in-bp-customphp/
https://codex.buddypress.org/theme-development/modifying-the-buddypress-admin-bar/