How to turn a character tag into a general tag?

How do I do this? The tag trilobite is currently a character tag for some bizarre reason, but every use of the tag is to refer to the Paleozoic creature.

Fixed it.

For similar tag-related tasks, click the Tags menu on the navbar (http://danbooru.donmai.us/tags)

You can edit tag types there.

Quicker way is to prefix it with "general:"

Just as a general reminder, Platinum- can only fix tags with < 50 posts. Builder+ can fix tags regardless of post count.