By default WordPress only allows you to exclude your whole website from search engine results page, this is done from Settings -> Reading page on WordPress admin.
WordPress doesn’t provides you any option for doing same for selective posts, pages and custom post types.
But there are many SEO plugins like WordPress SEO by Yoast that allows you to exclude individual WordPress posts, pages and other custom post types from search engine results page of Google, Yahoo, Bing etc.
Start by installing ‘WordPress SEO by Yoast’ in WordPress
Upon activation, you simply need to visit your post edit screen, scroll down to SEO section. From SEO section select ‘Advanced’ tab and tick ‘No Archive’ in ‘Meta Robots Advanced’ menu.