Re: A Few problems setting up my site.
You also have your breadcrumbs overlapping the categories box header. (I'm using Firefox.) And do you want the tagline that big and wide? People using narrower resolution screens will not see that same result -- when I narrow my browser, the text wraps and breaks the look of the header. I would suggest smaller text or an image.
You should be able to use the tpl_header.php file in your template to move the search box.
Everything else should be, as Kobra said, in the stylesheet.css file. If you're using Firefox, use the Firebug or web developer add-ons to locate the exact code in the stylesheet. Saves hours of time.
Lesli in SW Florida ~ writer, teacher, and dodging hurricanes!