unsuccessfully trying to add Image to header

Hi
I am using Total ver 1.1.5. for a new website i m buliding
I am unsuccessfully trying to insert a background image here

<header class="ht-main-header">
	<div class="ht-container">
		<?php the_title( '<h1 class="ht-main-title">', '</h1>' ); ?>
		<?php do_action( 'total_breadcrumbs' ); ?>
	</div>
</header><!-- .entry-header -->

so that every single page’s header will display the same background image.

I have tried changing the .ht-main-title & .ht-main-header classes in the Styles.CSS file, I even tried creating .ht-main-title2 & .ht-main-header2
but nothing budges – even the font attributes dont make any change.
To test myself I have even tried altering the background to a simple black color (rather than an background-image insert) and nothing seems to happen except that the F9F9F9 color of the background disappears.

I am desperate – any advise? am I changing the wrong styles ?

thanks
Jonathan