API Authentication?

I’m trying to access the calendar via the API using advanced rest client in Chrome. I’m afraid I may be using an incorrect syntax but it’s constantly prompting me for username/password and even when I enter that in, it’s saying unauthorized.

url- http://localhost:8989/api/calendar

header- apikey: mykey

Any assistance is appreciated!

The header is X-ApiKey as described on the wiki: https://github.com/NzbDrone/NzbDrone/wiki/API

Thank you very much. Sorry for the stupid question but was banging my head on this.