Montezuma Tag Line Color Change

I have tried changing the color of my tagline from the defaulted black to any other color, and it won't budge. I downloaded firebug like recommended in previous posts, I can add it as a rule there, see the change made on the preview of my page, but once refreshed it's right back to black again. Same thing with the header on my page. I have tried to delete it and do not know where I can do this in CSS, have only been able to do it through firebug. Please help, I am very new to all of this and am very frustrated.