why can't i change my display image in yahoo messenger?

[♣Yuki: Kio's mom♣]

I'm trying to change my display image but i can't.. what are the possible reasons?
I did all that but it's not working..

 

[Mr. NicK]

FOR YAHOO MESSENGER:
To create an avatar or upload personal photo:

At the very top of your Yahoo Messenger:
Click on: Messenger
Click on: My Display Image
Select: Share My Image
Click on: Select
Click on: Browse
Locate: The picture you want to use
Click on: The picture you want to use
Click on: Open