Problem with headers

[Edgar]

Hello, how do I change the header image? ( I' am newbie at this)
As I understand that I have to change something in header.php, but what exactly?
For blog title/logo I select Image Logo, but I don't know what to do next!
Click here to see my header.php
Please help me with this. :)

I got Genesis and Streamline Child theme, but don't have acces to Streamline theme threads becouse I got it from somewhere else...)
Maybe answer is in one of this topics, so if someone have access please post it here.
my designer's questions for streamline's header
Replace Header

how do i change logo?
Can not get image in header although it links
inserting a photo into the header?

I' ll realy appreciate any help here :)