How can I lessen the space between my header and the nav bar?

I read one post in the forum about this and think it can be done. But, I just need to know where and specifically what I should do.

I installed a logo with title jpg into the studio theme - which I love btw.

The jpg is 980x87

There seems to be a lot of excess background between the bottom of logo and nav bar. Here is the url:

Thanks in advance! Linda