Expressjs and handlebars, I can not get the logeado user ID

I'm trying to get the id of the user who is currently logged in, but I can not find a loop and it does not recover the id of the logged-in user, in order to edit a comment as long as it corresponds to the one who did it and to the user that is currently logged in.

// show view

     {{#each storiesView.comments}}
    <div class="horizontal">
        <div class="card-image">
            <p>{{author.name}}</p>
        </div>
        <p>{{createAt}}</p>

        <div class="card-content">
            <p>{{message}}</p>
        {{idStorie._id}}    

        <a class="btn-floating btn-small waves-effect waves-light red btn modal-trigger"
          href="/comments/edit" data-target="/{{id}}/comments/edit"><i class="fi-pencil"></i></a>

        <!-- Modal Structure -->
            <div id="/{{id}}/comments/edit" class="modal">

                <div class="modal-content">

                    <form action="/stories/{{idStorie._id}}/comments/{{id}}" method="POST">
                    <input type="hidden" name="_method" value="PUT">
                            <div class="input-field col s12">
                                <textarea id="textarea1" class="materialize-textarea" name="message"  required>{{message}}</textarea>
                                <label for="textarea1">Edita el comentario</label>
                            </div>
                            <button class="btn waves-effect waves-light green darken-4" type="submit" name="action">Enviar</button>
                    </form>    

                </div>

            </div>  
        </div>

         <hr>

    </div>
    {{/each}}

// route

router.get ('/: id', (req, res) = > {     Storie.findOne ({         _id: req.params.id     })     .populate ('user')     .populate ('comments')     .then (stories = > {

    if(!stories){
        req.flash('error_msg', 'la Historia ha sido eliminada ');
        res.redirect('/');

    }else{

        res.render('stories/show',{storiesView: stories,
                                   currentUser: req.user});
    }


})
.catch(err =>{
    console.log(err);
})

});

// model storie

const StorieSchema = new Schema ({

title:{
    type: String,
    required: true
},
description:{
    type: String,
    required: true
},
comments:[{
    type: Schema.Types.ObjectId,
    ref: 'comments'
}],

user:{
    type: Schema.Types.ObjectId,
    ref:'users'
},
date:{
    type: Date,
    default: Date.now
},

});

// model comment const CommentSchema = new Schema ({     message: {         type: String,         required: true     },     createAt: {         type: Date,         default: Date.now     },     author: {         userId: {         type: Schema.Types.ObjectId,         ref: 'users'     },     name: String },     idStorie: {         type: Schema.Types.ObjectId,         ref: 'stories'     }

});