code: @Modified
      protected synchronized void modify(QuickStartSecurityConfig config) {
          this.config = config;
  
          validateConfigurationProperties();
  
          if (urConfigReg == null) {
              registerQuickStartSecurityRegistryConfiguration();
          } else {
              updateQuickStartSecurityRegistryConfiguration();
          }
  
          unregisterQuickStartSecurityAdministratorRole();
          registerQuickStartSecurityAdministratorRole();
      }
docs: Push the new user and password into the registry's configuration.