The meta keyword tag is a list of keywords for search engines. Unlike the meta description , we can generate automatically the meta keywords (We can generate automatically the meta description ,too but it`s better to write ). Usually the most relevant keywords of a post are in the title, so we can use the keywords from the title as meta keywords. It`s simple to do it , just follow these easy steps:

1. Go to Layout , Edit HTML
2. Find the following code:
<b:include data='blog' name='all-head-content'/>
3. Add the following code after it:
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<meta expr:content='data:blog.pageName' name='keywords'/>
</b:if>
4. Save template
NOTE: Google do not place much weight on these keywords but yahoo and some search engines are using them.