When 你 change your 个人资料 Layout, where do 你 copy the code to? where in your profile?

It depends if ur using the old version 或者 new 个人资料 2.0

Old version- u put in the About Me section
个人资料 2.0- Click customize, at the 最佳, 返回页首 find where it says "CSS" and click on it, put the code in the blank box