你 need to go to your 个人资料 them to your pictures if u never contributed then press 上传 then get the picture 你 want and it should say below do 你 want this as your 阿凡达 (something like that) and all u have to do is press the box beside it and tada ur all set up! if u still don't understand I will be 更多 than happy to make 你 a step 由 step instructions with pictures if it will help u一年多以前