Categories in Ping

Is there a way to “clean up” my categories in Ping? If you look at my new site, How To Reason you’ll see Select a Topic in the right sidebar. After categorizing a lot of posts under Logic, I realized I wanted to differentiate between Formal Logic and Informal Logic. Is there a way to simply go in and edit the title of a particular category or do I have to create the new category and then go post by individual post to recategorize them all?

Thanks,
Mark