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In your Joomla dashboard, go to System, then select Plugins
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On the next page, search and select TinyMCE
3
Select Set 0 (for Super Users)
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Scroll down and turn on the Use Joomla Text filter
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And turn off the Sandbox Iframes toggle
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Return to the main dashboard, then go to System and select Text Filters
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Make sure that Super Users is set to No Filtering
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Paste the embed code to source code editor