Not sure what it is you are struggling with ... if you want to add a 
comment to a Post then echo a form with a hidden field containing 
Comment.post_id.

If wanting to view a Post and it's comments then:
$this->set('post', $this->Post->find('first', array(
  'conditions'=>array('Post.id'=>$id),
  'contain'=>array('Comment')
)));

And then loop through $post['Comment'] in the view showing each comment.

You might also want to take a look at CakeDC's comments plugin:
https://github.com/CakeDC/comments

HTH, Paul.

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