Content block HTML edit won't save

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Hi,

I'm trying to add a font-awesome icon inside a link created within the WYIWYG editor. When I enter the HTML source and edit the HTML by adding "<i class="fa fa-twitter fa-2x"></i>" inside the a tag, is does not save the edit.

How can I set Concrete5.6 to let me save HTML edits inside the content block?

 

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