Adding header image to BFA Round Tabs

On the information page it says you can add your own header image to BFA Round Tabs through the options page. However, I have not found that option. I've tried to add a header image in the code, but it doesn't display properly.

Any suggestions? Could someone point me to the EXACT place in the header.php to add the image manually? I've added header images to other blogs before, but I just can't seem to wrap my head around this one.

Thanks in advance.