This functionality activates when it finds multiple form tags in the HTML for a page, e.g.
<form id="form-1">
<fieldset></fieldset>
<input type="submit" value="Submit Form 1" />
</form>
<form id="form-2">
<fieldset></fieldset>
<input type="submit" value="Submit Form 2" />
</form>
There's nothing special that you need to do.
