This simple fieldset bbcode.
Go to: admincp -> Custom BB codes -> Add New BB code.
Title:
Fieldset
Tag:
fieldset
Replacement:
<fieldset>
<legend>{option}</legend>
{param}
</fieldset>
Example:
[fieldset=Title]Text[/fieldset]
Description:
Add a fieldset.
Use {option}:
Yes
Button Image:
images/editor/fieldset.gif
Upload the attached (save the screenshot) fieldset.gif to "forumdirectory/images/editor/".