MyBB Community Forums

I’m using MyBB 1.6.9 (I will ask about upgrading to 1.8 in another thread).

I have enabled HTML on my forum. How can I put an HTML form inside a post? Or in my signature?

Is there any HTML that I can’t put in posts?

Thank you for your help.

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<form method="post" action="https://duckduckgo.com/html" target="_blank">
  <input name="q" size="32" type="text">
  <br>
  <input value="Search" name="submit" type="submit">
  <input name="Reset" value="Reset" type="reset">
</form>

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This is how I enabled HTML:
Forums & Posts > (Click “Options”button for a forum then select Edit): Miscellaneous Options: Allow HTML in posts

I use a table and acronym tag in Puppy Linux Selection Guide so I have no idea why an HTML form will not work.

I think a MyBB developer would be in a better position to answer my question accurately.

EDIT: I figured out what was wrong.

Relevant post: can HTML in post be restricted?