cod to change meta for each messages ?

Hi good morning to all,

I've read you can put cod to get meta tags to ypour blog and new one for each message.

Here the links

-http://www.bloggertricks.com/2007/12/adding-meta-tags-to-bloggerblogspot.html
-http://free-blogger-help.blogspot.com/2009/05/adding-meta-tags-is-one-good-procedure.html

trouble with the cod i can not find it,

Now procedure to add meta tag to any post of your website e.g.

<b:if cond='data:blog.url == "http://free-blogger-help.blogspot.com/2008/08/list-of-useful-blogger-widgets.html">
<meta content='Type you post description here.' name='description'/>
<meta content='Type, the, post, keywords, here' name='keywords'/>
</b:if>

Repeat above step for as many blog posts you want to have unique META Tags for.

but if you look in my blog cod i can not find first all messages, and line <b:if cond='data:blog.url ==

have made 2 messages inside