Try setting up a custom template for yourself...
In the /includes/templates directory make a folder named 'custom'. Place inside this folder a copy of the /includes/templates/template_default/css folder. And create an image folder in the custom folder also.
You now have a folder "custom" and inside of it a css & image folder. The css folder has copies of the template_default/css files in it.
FTP a copy of the template_info.php file to your PC and open it in a editor (notepad or?). where you find
Code:
'$template_name = 'Default Template';
change to:
Code:
$template_name = 'custom';
Save it. Now FTP this copy of the template_info.php file to the /custom folder.
If you have a logo that is about 200x100px and it is a gif file, rename it to 'logo.gif and ftp this to the /custom/image folder.
Now in admin > tools > template selection > you should see the custom as a template selection. Select 'new language' and use the dropdown for the template name and select custom then insert.
Then tools > layout boxes cotroller > and scroll to the bottom and select reset
Now load your site in your browser and you should see your logo displayed. You have just successfully used the override system and changed the displayed logo and only had to edit one zen file(template_info,php).
Pat yourself on the back and admire the small step you have made.
You have just progressed from 'lost' to 'Zenned"!!