problem with SEO

I have a problem with the creation of meta tags. For my website using the Yoast WordPress SEO plugin and I created meta description and meta keywords customized for every page.
About analysis of the HTML code, however I find duplicates from the same code the following items
<meta name = "Description" content = "">
<meta name = "keywords" content = "">
in addition to those created by Wordpress SEO.

How can I disable the SEO of the theme and prevent the creation of these blank entries?

thanks

Hi!
Please, delete the following text:

echo "<title>".sprintf($format,$title)."</title>\r\n";
echo '<meta name="Description" content="'.preg_replace('/[\'\"]/', '',$descr)."\" />\r\n";
echo '<meta name="Keywords" content="'.$keywords.$this->get( 'seo', 'keywords' )."\" />\r\n";

from folder inc--> library.php located in the directory of the theme.

thanks, but I think I made ​​a mistake, I made the change to the file library.php original and substitute the one on the site. Now I see a footer link in red that says: "Please return to the footer links Following:
Designed by FWPThemes.com, thanks to: Pozycjonowanie Koszalin, Angry Birds Games and Link Text" and I have trouble viewing widget

I have a second question about the seo. The analysis says I have duplicate titles h1, in fact for every page there are 2 titles h1: the site title and page title, how can I change the title of the page in h2?

Hi!
To change the html code of the posts/pages you just have to edit the file theloop.php. It is located in the directory of the theme.