This plugin allows you to include snippets in your posts/pages.
To use this Orbisius plugin you need to create/edit a page/post.
Then create a <a href='https://codex.wordpress.org/Custom_Fields' target="_blank">custom field</a> (e.g. orb_snippet1) and paste the snippet into the value box.
To make the snippet show up use this shortcode in the post/page's content like you would with any other shortcode.