Quick question: At the risk of coming off as too stupid, why can't I add an avatar?

1) I went to Flickr and created an account (as suggested on the forum)
2) I uploaded the image I want to use - resized to 81 X 125
3) I opened the image and copied & pasted the URL from the address bar to the appropriate field in "Edit Avatar"
4) "The URL specified is invalid." comes up instead of the image
5) My confidence in my abilities is undermined
6) Repeat

Some guidance would be greatly appreciated.

Thanks,
RoPo

Got it sorted.

Thanks,
Roland