I just added a new comic and then uploaded the cover, and the thumb nail says it is rated "E" and that it is an adventure or something. It certainly is not either of those things; it is rated mature and it is a horror comic. I know that's what I put down for it. How can I fix that?
Edit;; It did that for both comics! What's the deal?

Fantasy and E are the defualts. It will update eventually to the correct thing, but it just takes a bit of time. :)

Okay, good. XD I was just worried because some younger kid might think it's okay to read the horror one, but luckily nothing mature has been posted yet.

... It still hasn't yet. >_>;

I had a look at your comic account settings and both comics were set to E.
Just click on account settings, and then click "Show Advanced Comic Descriptions" which is near the bottom of the page. That will give you the options for changing rating, genre and all that stuff.
You comics are both M now, you can change that to whatever you prefer though. Now that I've made that change the thumbnails will probably eventually updated :)