XF 1.3 Website Header

Hey guys, I apologize in advance, because this is probably really basic, but i'm really new at this. But anyways, I am trying to get my header up on my site (www.nbamyteammobile.com), so I went to my forums folders, and put the image I want to use in the www folder, then I went to my header options, and put the header to: @www/banner1.jpeg. However it is still not showing up. Any idea why this is, or if i'm doing it wrong?