Divi Integration Tab allows you to add some custom changes to your site. It allows to add changes in HTML format. This means you can add a script, plain text, html etc. PHP code is not allowed. 

You can add your changes in four different fields based on where you want the code to be executed exactly:

  1. In the <head> element;
  2. In the <body> element;
  3. In the top of your post pages;
  4. At the bottom of your post pages;

You can find the Integration tab under the WP Admin > Divi > Theme Options > Integration tab:

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