I'm a complete n00b. Except that I know what a n00b is, which in comparison to most people I know makes me an expert.
I saw you answer somebody's question about css in the community help forums, and you mentioned that you could help more if the person posted on your message wall, so here I am.
Basically, the little thing that comes up when I add a new image that says "Added by Kiwiatwikia" really bothers me. I looked in the forums for an answer and I found one! (yay!) Unfortunately the answer said that I had to edit the wiki's css ... I don't even know where to begin.
Since this is a case in the Wikia skin CSS, you're going to have to edit MediaWiki:Wikia.css. Add the code that was provided in the forum into MediaWiki:Wikia.css and then save it and then clear your cache. To clear your cache, there should be instructions on the top of the page.
If you need any further help, I'll be here to help!