how to link to categories?

Thanks for your quick reply !

Maybe that's also a possibility, but no.
I just want to have a direct link to a category.
And when I link to that, It only shows that category (not the others). (in phpBB there's a possibility like that, but I don't like phpbb)

That way I can give english users on my site the link to the english categorie.
And french users the link to the french categorie.

In the current version of PunBB there are no links to categories. But it is a nice idea, and we will implement it in future releases of PunBB.
You can create a page with categories by yourself. It will not so hard. As a base for this page you can get the file "<FORUM_ROOT>index.php". To get forums of some specific category you can use this query:

// Print the categories and forums
$query = array(
    'SELECT'    => 'c.id AS cid, c.cat_name, f.id AS fid, f.forum_name, f.forum_desc, f.redirect_url, f.moderators, f.num_topics, f.num_posts, f.last_post, f.last_post_id, f.last_poster',
    'FROM'        => 'categories AS c',
    'JOINS'        => array(
        array(
            'INNER JOIN'    => 'forums AS f',
            'ON'            => 'c.id=f.cat_id'
        ),
        array(
            'LEFT JOIN'        => 'forum_perms AS fp',
            'ON'            => '(fp.forum_id=f.id AND fp.group_id='.$forum_user['g_id'].')'
        )
    ),
    'WHERE'        => 'fp.read_forum IS NULL OR fp.read_forum=1 AND c.id = '.$cat_id,
    'ORDER BY'    => 'c.disp_position, c.id, f.disp_position'
);

$cat_id in this peace of code is the category id.