How do i change a certain part of my you tube background?

you know how some channels on you tube have those lay outs i.e. meekakity , ijustine, fred. above there videos: click to see what i am talking about: http://www.youtube.com/user/Fred



usee how he has the toysRus layouut can i change that :? :? :? :?How do i change a certain part of my you tube background?
You have to be a youtube partner to do that. You need a lot of regular viewers to become a partner.