how to change success message?

We have a filter in place for that: wppb_edit_profile_success_message

You could so something like this:

function wppb_replace_edit_profile_success_message($message){
       $message = __('Your desired success message.','profilebuilder');
       return $message;
}
add_filter('wppb_edit_profile_success_message', 'wppb_replace_edit_profile_success_message')

The code above should go in your theme’s functions.php file or in an empty plugin like this one.

Sorry about that, when I pasted the code I left out a ; at the end.

Here’s the correct one:

function wppb_replace_edit_profile_success_message($message){
    $message = __('Your desired success message.','profilebuilder');
    return $message;
}
add_filter('wppb_edit_profile_success_message', 'wppb_replace_edit_profile_success_message');