[RSS Feed/News] Cannot use <script> or <iframe> anywhere.

[XenForo]

Hello, each attempt I make at using any <script> or <iframe> in html, anywhere, results in the following error:
Code:

Oops! We ran into some problems. Please try again later. More error details may be in the browser console.

This is particularly irritatating, as I cannot setup adsense, embed youtube videos, or do hardly any serious html work.

Please help, thank you.

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