code: public function actionAccount()
      {
          /** @var SettingsForm $model */
          $model = \Yii::createObject(SettingsForm::className());
  
          $this->performAjaxValidation($model);
  
          if ($model->load(\Yii::$app->request->post()) && $model->save()) {
              \Yii::$app->session->setFlash('success', \Yii::t('user', 'Your account details have been updated'));
              return $this->refresh();
          }
  
          return $this->render('account', [
              'model' => $model,
          ]);
      }
docs: Displays page where user can update account settings (username, email or password).
  @return string|\yii\web\Response