We are striving for a more unified interface and a unified key that you can use in multiple services. The key is now located under Settings (just bellow Feedback).
I agree that we should do a better job of explaining these kinds of changes. Sorry for the inconvenience caused.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items