MyBB Community Forums

What will be the query to do that? The posts by guests are in FID 66, and it's like 500 and full of spam, how do I delete them all from that forum?

Thanks.

Backup your database table first, then run this query;

DELETE FROM `mybb_posts` WHERE `fid` = 'X' AND `uid` = '0';

Replace mybb_ with your table prefix.
X = Forum ID from where you want to delete from