Validation message with the shortcode [ultimatemember_account tab=”password”]

I’m using the shortcode [ultimatemember_account tab=”password”] and I need to display a message that confirms the change.
On my page I only have:
Current password, password and confirm password and validation button
I saw that the processing is done in the class-account.php file.
Could you tell me how to add code when the password is updated.

Thanks