[TYPO3] How can I add a legend tag to the contact formular?

[news.netfielders.de]

Hello List,

I'm trying to build contact formular like in :
 http://www.pixy.cz/blogg/clanky/css-fieldsetandlabels.html


But I have no idea, how can I add a legend tag to the fieldset tag with a 
value.

Like the sample below.
<form>
  <fieldset>
  <legend>Subscription info</legend>
    <label for="name">Username:</label>
    <input type="text" name="name" id="name" />
    <br />
    <label for="mail">E-mail:</label>
    <input type="text" name="mail" id="mail" />
    <br />
    <label for="address">Address:</label>
    <input type="text" name="address" id="address" size="40" />
  </fieldset>
</form>Has anyone an idea?
Many thanks in advanced.

Regards,
Ercan Karadeniz