What is code for my RSS link

I feel really stupid. All I want to do is have a dedicated RSS feed link button on my header.

I’ve added the line to my header file, but the actual feed code is wrong

<li class="page_item"><a href="http://www.simi-therapy.com/blog/feed"><img src="http://www.simi-therapy.com/blog/wp-content/uploads/2009/feed.png" border="0"></a></li>

I’ve tried several iterations but can’t see to get it right. What is supposed to be?

Here’s my blog
http://www.simi-therapy.com/blog