how to change view, update and delete url on action column in yii2

I have create action on update and view in controller, but this action does not change on action column in index page

 public function actionLeadView($id){
   $id =  $_GET['id'];
   $model = Leads::findOne($id);
   retu $this->render('viewlead', [
            'model' => $model,
        ]);
 }    
 public function actionLeadUpdate($id){
   $id =  $_GET['id'];
   $model = Leads::findOne($id);
   date_default_timezone_set("Asia/Kolkata");
   $date = date('Y/m/d H-i-sa');       
    if ($model->load(Yii::$app->request->post())) {
      $model->modified = $date;
      if($model->validate()){
         $model->save();
         retu $this->redirect(['viewlead', 'id' => $model->id]);                
            }else {
            retu $this->render('updatelead', [
                'model' => $model,
            ]);
      }    
} 

else { retu $this->render('updatelead', [ 'model' => $model, ]); } }