$messagearea not displaying

[reddyink]

Rightnow I have textarea for description field. I want to replace with $messagearea which has all font, size editor toolbar.
I tried using $messagearea in template
<div style="padding:$stylevar[formspacer]px">$messagearea</div>
but nothing is displayed.

I also tried putting
require_once(DIR . '/includes/functions_editor.php'); this line in my php page but no effect. Messagearea is not displaying in my page.

What else do I need to add to my php page to display.

Thanks in advance.