Open BoardIndex.template.php
Find
$dbresult = db_query("SELECT p.ID_PICTURE, p.commenttotal, p.filesize, p.views, p.thumbfilename, p.title, p.ID_MEMBER, m.realName, p.date FROM {$db_prefix}gallery_pic as p, {$db_prefix}members AS m WHERE p.ID_MEMBER = m.ID_MEMBER AND p.approved = 1 ORDER BY p.ID_PICTURE DESC LIMIT 4", __FILE__, __LINE__);
Change to
$dbresult = db_query("SELECT p.ID_PICTURE, p.commenttotal, p.filesize, p.views, p.thumbfilename, p.title, p.ID_MEMBER, m.realName, p.date FROM {$db_prefix}gallery_pic as p, {$db_prefix}members AS m WHERE p.ID_MEMBER = m.ID_MEMBER AND p.approved = 1 ORDER BY p.ID_PICTURE DESC LIMIT 5", __FILE__, __LINE__);
And make sure in the same file that $maxrowlevel = 5;