Sample of a general meta tag and how to use it on blogger can be found on this blog postas the one shown below is for specifying unique meta tags for different posts.
<b:if cond='data:blog.url == "BLOG-POST-URL-HERE"'>
<meta content='DESCRIPTION' name='description'/>
<meta content='KEYWORDS' name='keywords'/>
</b:if>For this particular blog post, my unique meta tags for it should look just as shown below:
<b:if cond='data:blog.url == "http://www.doncaprio.com/2011/09/meta-tags-different-unique-posts-blog.html"'>
<meta content='How to add different meta tags for different blog posts. This post explains how to use unique meta tags for blog post on blogger.' name='description'/>
<meta content='meta tag, blog, different, unique, search engine ranking, google' name='keywords'/>
</b:if>