One file you ought to take a look at is:
includes/languages/english/header.php
Make a COPY of this file, and put that copy into:
includes/languages/english/CUSTOM/
(you will need to create the folder "CUSTOM" first.)
Now that you have that header.php file in your CUSTOM folder, open it for editing:
You will see:
PHP Code:
// added defines for header alt and text
define('HEADER_ALT_TEXT', 'Powered by Zen Cart :: The Art of E-Commerce');
define('HEADER_SALES_TEXT', 'TagLine Here');
define('HEADER_LOGO_WIDTH', '192px');
define('HEADER_LOGO_HEIGHT', '64px');
define('HEADER_LOGO_IMAGE', 'logo.gif');
(You can change contents of HEADER_ALT_TEXT to your own text.)
If you don't want the TagLine text, remove the string, so you have:
define('HEADER_SALES_TEXT', '');
(Make sure to retain the two single quote marks shown in RED above.)
Next, make the necessary adjustments to the logo width and height values. (These should match the values of YOUR OWN logo)
Next, make sure the NAME of your logo image is inserted where you see "logo.gif".
(It may be that your logo is already called "logo.gif", in which case leave it alone.)
You say your logo has a transparent background? Therefore it must be a GIF or PNG as JPG cannot have a transparent component.
Replace the zencart logo.gif, with your logo.
This image will go to:
includes/templates/CUSTOM/images.
Then I'll take another look at your page...