Kyle...
The reference is in the very first entry on the FAQ page. It appears to be part of a standard template FAQ as other boards using this software have identical text. The reference is pasted below...
Question :
Can I use HTML when I post new topics and replies?
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Answer :
No, you cannot. You may use certain Ideal BB codes, but you may not use HTML. We limit the use of HTML as a security precaution. Many hackers could embed bad code into one of their posts which could damage your computer. Our system agressively removes that code.