ok , what i did to put a pic in is , i got to profile which is at the top , then i go to edit profile , once i was in there i went to signature and across where it says signature there is a box and under it there is a thing that says upload custom signature image , so i clicked that and i uploaded a pic i saved and they put a long thing which u have to copy into your profile so i copied and went back to the box and pasted it there then i go to submit modifications which is at the bottom then i was done.