[paradoxG(r)eek]

1.- PHP File

$show['wysiwyg'] = ($vbulletin->options['allow_bbcode'] ? is_wysiwyg_compatible() : 0);
$istyles_js = construct_editor_styles_js();
$show['qr_require_click'] = 0;
$editorid = construct_edit_toolbar($ad["description"], 0, '', 1, 1, false, 'fe');
$messagearea = "
		<script type=\"text/javascript\">
		<!--
			var require_click = false;
			var threaded_mode = 1;
			var is_last_page = false;
		// -->
		</script>
		$messagearea
";

Replace $ad["description"] with your own field

Template:

$messagearea

If you want to use Quick Reply editor instead the full editor then use 'qr' instead of 'fe' at:

$editorid = construct_edit_toolbar($ad["description"], 0, '', 1, 1, false, 'fe');

--------------- Added [DATE]1488284668[/DATE] at [TIME]1488284668[/TIME] ---------------

I think that I was out of topic before .... Thought that you want to add vb Editor to textarea.

require_once(DIR . '/includes/class_bbcode.php');
$any_variable_name = convert_wysiwyg_html_to_bbcode($vbulletin->GPC['your_field_name']);