how to ues render_comment_form correctly

HI, everyone.
Some questions about the render_comment_form tag and the
get_comment_form tag make me confused.
Here is my code:
#blog_detail.html

{% extends "base.html" %}
{% block content %}
<h2>{{ post.title }}</h2>
<p>{{ post.timestamp }}</p>
<p>{{ post.body }}</p>
{% load comments %}
{% render_comment_form for post %}
{% endblock %}

When I submit the form, "CSRF verification failed. Request aborted."
appears.
I have installed the comments app as the document said.
I don't write a view, because I think there is a default view to do
this.
Thank you for helping me.

yours

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