To change banner for #882 go to:
Control Panel » Customize design » Common templates » Style sheet (CSS)
Find this line (located on the 4th line)
Quote
#logoBar {width:944px;height:215px;background:url('/.s/t/882/3.jpg') no-repeat;}
Replace blue url with your banners url. Since you provided the banner I already replace blue url with your banners url.
Quote
#logoBar {width:944px;height:215px;background:url('http://i682.photobucket.com/albums/vv187/xFragged/impactgaming-2.png') no-repeat;}
