New to WP so please be gentle.
I have installed Atahualpa 3.4.9 and have managed to load a header image ok but any style changes I make in the options pages make no difference to the blog pages when I go to view them by clicking the blog name link at the top of the page.

I've been trying to change background colors and border widths just by changing existing colour codes so nothing complex.
Can someone give me some guidance on what I'm doing wrong or not doing to make these changes take effect? I have been hitting the big Save Changes button at the bottom of the page.
Thanks.