Adding a new header category?

[ebrashier]

I am trying to change one of the header categories (that run across
the top of the blog), but I can't figure out how to access it. It's
not in my pages folder. It currently says "Featured" and I want to
change it to an "About" page.

Any ideas would be greatly appreciated!!

Note: I didn't set this blog up - I'm taking over for the person who
was in this role before me... :)