keyword & description content help

I have scoured the forum about this and they all say the same thing but my problem is when i go to copyscape.com and see that other site have the same keywords i figured i had to change something. I have entered in custom keywords but no matter what when i look at page scource it still shows the meta name "keywords" and "description" content to be my category names and with my custom ones. How can I change this so it is just custom keywords are in the "keyword" location and a written description of site in the "description" content?
thanks for any help

Well... you can stop fretting about the KEYWORDS tag... search engines all ignore it completely. It serves no purpose other than to waste your time. Better to leave <meta keywords> completely EMPTY.

And the <meta description> is also not much of a factor in search engine ranking, because Google (particularly) likes to formulate its own description these days, from page content and other areas.