[Plugin: ProjectManager] Searchform example doesn't work

Kolja thanks for this good plugin.
But I have a problem.
I have no idea how to use the searchfom-compact and searchform-extend template.

There ist no forwarding action information in the Form Tag
<form class='search-form alignright' action='' method='post'>

How can I use this Examples that it works?
Thanks, Davelee

here the hole code of searchform-compact.php

<form class='search-form alignright' action='' method='post'>
<div>
	<input type='text' class='search-input' name='search_string' value='<?php echo $search ?>' />
	<input type='hidden' name='form_field' value='0' />

	<input type='submit' value='<?php _e('Search', 'projectmanager') ?> &raquo;' class='button' />
</div>
</form>