Comment on WordPress Header Images by Andrei.

WordPress Custom Header Options I’ve made “Show Alternative Header Area**” in Layout Options.
And in Colour Options I have found “Alternative Stallion Header Area Header Image” dropdown menu. As I understand I have to choose custom 1 jpg? But where to upload it?
Now there is a default image. Please check my site:

And also after those manipulations you can check that a Title with a tagline have moved down with a tagline doubled in the top. What have I done wrong?