i cannot se my wp stats

when activating the wordpress stats plugin I get the message “WordPress.com Stats needs attention: please enter an API key or disable the plugin..” My problem is that their is no where to enter the API key. When I go to wordpress.com stats under plugin there is no where to enter the key and when i got to my actual stats page it says “You have failed to authenticate with the WordPress.com API.” I am lost. I have tried many different browsers and its all the same. when I did a search in the forum I saw a post that showed a picture of the box where you are supposed to be able to enter you key, but it doesn’t show up for me at all. any ideas?