UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? Mysterious Postings

I have user registrations suspended on my forums, but somehow posts are showing up with a user_id of 1, which belongs to **DONOTDELETE**. They're coming from multiple ip addresses, so blocking those would be futile. Can I delete the user **DONOTDELETE** or change the password? I've already banned that user, but to no avail.

Any help would be appreciated.

Thank you.