Why won't it let me change my picture on my yahoo 360 page?

Ok, so I am trying to download pictures from the internet to my yahoo 360 page and it won't let me. I go on google.com, go on images, type in pooh bear and I find one, then go to the page then click on see full-size image, get the website ( copy) and go to my yahoo 360 page and click on edit personal photos, and then past it to the place were it says to and I click on browse, and it won't download it! Can you please help me!