How can I add a search box in each forum(In description)?

Hi all,
How can I add a search box in each forum's description like the french forumotion's support http://prntscr.com/3z5b2v ? My forum version is PunBB.

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Get a code for a search box and enter it in the forum's description box you want to have a search option.

Here is a small search form :

Code:

<form method="get" id="forum-search" action="/search">
  <fieldset>
    <input class="inputbox search tiny" name="search_keywords" id="search_keywords" size="20" value="Search" onclick="if (this.value == 'Search') this.value = '';" onblur="if (this.value == '') this.value = 'Search';" type="text">
    &nbsp;
    <input class="button2" value="Search" type="submit">
    <input value="f1" name="search_where" type="hidden">
  </fieldset>
</form>

This is the specific forum that you're searching (f1 = forum 1)

Code:

<input value="f1" name="search_where" type="hidden">

I'll use the above for sometime later in a script just to let you know.

Thanks its solved.