@WM-7Ebra There are quite a few internal references that use the cid, so it's not quite that simple to dive into the db and change things (though please don't let me stop you ) If you don't have a lot of content on your forum, it might just be easiest to trash the forum and start over! Or if cid 2 is still around (not purged), you can delete all of the topics inside it, and move all the topics from cid 3 into cid 2.