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I recommend checking out the Yoast Wordpress SEO plugin instead. You can visit this guide: http://yoast.com/articles/wordpress-seo/ to optimize the plugin which will really help your site out a lot.

Agree with Felip. Yoast SEO is an excellent on-page SEO plugin for Wordpress. I love the 'Force rewrite Titles' feature as with just one tick mark, all your titles are optimized. Cannot imagine working with WP sites without this plugin.

With the recent changes to the algorithm Google has started the move toward more semantic / intelligent search.  What this ultimately means is writing for the user.  So it's still very important to include your key phrases that you have identified as part of your research phrase but in a way that is very natural and what the user would want to read to help them find their answer they were looking for when they entered it into Google. In the past many SEO agencies etc have made the mistake of just cramming pages with keywords / phrases that might rank in Google and deliver traffic but do not deliver any conversions. Hope this makes sense and helps