Q2A generate Meta description dynamically and SEO friendly as per your page. Keywords I think it is not so effective see this http://googlewebmastercentral.blogspot.com/2009/09/google-does-not-use-keywords-meta-tag.html
Still if you want to add into the theme file you can overreide head_metas() method. (see in qa-include/qa-theme-base.php around line no#244
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