I would like to add ads after every post. I have researched but what am receiving all results of old Atahualpa themes. how do i add ad codes in the theme for ads to appear at the bottom of every post?

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I have searched but i cant get a solution. Can someone point me to that thread?

I think there are plugins for that as well. Try a search on wordpress.org

I need the ads below comments in every single post page

You may have to do some coding of the theme files to do that but you already have what I would consider to be too many ads. That is just going to clutter the site with more. A few well placed and targeted ads are going to be more effective.