I want to make the font-family different for H1 tags... well what I really want is for the post/page titles to have a different font... but here is what I did:

In css.php I changed the following:

h1 { font-size: 34px; line-height: 1.2; margin: 0.3em 0 10px; font-family: "Copperplate Gothic Light", Arial, sans-serif; }

However I do not see a difference on the site:http://www.naturallyfitfood.com/

Any ideas???

Don't mess with CSS.php, just put it in the CSS inserts option, then it will remain during upgrades. You won't have to worry about remembering to do it each upgrade