We bloggers here at WordPress.com cannot access metadata files and edit them. This is a multiuser blogginplatform where all blogs using the same theme use the same templates and only Staff can access those files and edit as every edit they make affects all blogs using the same theme.
Keyword metatags are not required for SEO pu[poses and Matt Cutts has said that as far back as 2009. Watch the video here > Revisiting Keywords and Tags Search engines are focused on keywords in your content.
To verify blog ownership of a WordPress.com blog with the major search engines you must use this process > http://en.support.wordpress.com/webmaster-tools/ Note also that WordPress.com automatically supplies sitemaps for our blogs to search engines - we do nothing.
The strongest factor when it comes to pageranking is how many other bloggers choose to link to your content.
These are the positive factors that Google’s algorithm takes into consideration when determining PageRank:
Keyword use in title tag
Global link popularity of the site
Anchor text of incoming links
Link popularity within the site
Age of the site
These are the negative factors that Google’s algorithm takes into consideration when determining PageRank:
Server is often inaccessible to Googlebot
Content which is very similar or duplicate to existing content on the web
External links to low quality sites
Participation in link schemes or actively selling links
Duplicate meta tags on more pages