He want you to remove the white background for the forum to see easier.... It's not hard to place another one without the white background, unless English is not your main language then it is fine if you don't understand.
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actually IT is Banner for youtube.. Banners are 2560x1440..
So i cant delete the white things since its a banner youtube and other NORMAL website will automatically remove the white from it since the banner is already at it size..
Basically, just goto his youtube to see his actual banner
http://puu.sh/hcDRO/f43ce60ef3.jpg
http://i.imgur.com/uNp28EY.png
You just ****ed up