Pages changed to html from php - redirect ? [Closed]

Registration date
Saturday August 15, 2015
Last seen
August 15, 2015
I've changed the whole website to an html one, how can I get the google listings redirected? We are usually first for most search queries but of course users get a 404 not found error. I have read your PHP Redirect to another page (redirect header) page but I'm not sure where to put the code.
Thanks for any help.
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