I launched the new website for our culinary program. The only complaint I have from our director is that there needs to be more color on the design. I thought I would add a background images. Since I'm pretty new to Joomla, what files do I edit on the theme and fonts?

We need a strip on the top to add our student email, our web portal, etc (see attached). An example would like like your theme "Manook". Should I edit the theme files or do I make this change in the T3 layout?

Thanks!