WPMU Dev API Key

Hi

The attached screenshot shows a link from which I can enter the WPMU Dev API key. When I click it it goes nowhere (http://realestatetribe.com.au/wp-admin/tools.php?page=wpmudev#wpmudev_apikey). This means I can't access auto-updates, which I'd like to do. What do I need to do to change this?

On a related topic, what is the best way to delete unwanted Must-Use plugins?

Thanks in advance.

Peter