Text ?

Write what you want in the pre-nav box. I styled (in the css file) the pre-nav under #top-section. There is a #top-section a and a "simple" #top-section.
So if you make your/the website name a link to your home (as it is really often), it will be styled as the exhibitions/projects titles are on this demo site.
All the rest of the pre-nav text will be styled as the sections' titles.
You can style the #top-section a and the #top-section as you want to suits your needs.

Logo ?

Just adapt this code taken from this thread…
< img src='/path/to/image.jpg' width='123' height='123' />