mmagocs on "Comment option not showing up"

Hi--

My blog: http://eatyourcolors.wordpress.com/

I'd like people to be able to comment on my last post, but the comment option doesn't seem to be there.

This is what is currently in my CSS box:

p.tagged {
display:none;
}

p.num_comments {
background:none;
}

.post_meta {
display:none;
}

Is it possible to enable comments for only certain posts, but not all? For example, this last post I made, but not any of the previous ones? How do I do that?

Thank you!