I have no knowledge of CSS or HTML. Would I have to learn these to make the simple changes I need?
Acutally this is the wrong forum to get answers to your questions, for this is the forum for the CMS not CSS.
I would recommend you to google for easy css / xhtml tutorials or blogs.
However, sometimes you will get answers also here.
But if none are coming, just google.... there are tons of blogs on this topic.
Kind Regards,
Stefek