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Thanks for pointing this out. In fact the reason why I changed it from config_forum.php to config_forums.php is that I plan on possibilities of integrating more than just MyBB. In future, users will need to select a forum engine they wish to integrate with their sites, although MyBB is highly recommended over other forum engines such as PhpBB, SMF and PunBB. Integrating with commercial forumwares such as Vbulletin, IPB and XenForo is also possible, but will most likely come out as premium Mod.