The WordPress editor both autoformats your text and restricts the types of tags that are inserted into your content. While some users who are attempting to insert scripts find this frustrating, it’s not a design flaw. Blocking the ability to insert scripts is a security feature.
That being said, if you are a Business-level Wordpress user, you can easily embed New/Mode tool code. Here's how:
Step 1: Copy and paste your New/Mode tool embed code into your page/post text editor.