Hi Chris,
Depending on whether you've installed the authoring using Vagrant or the manual method, there are different steps required to sort this out.
If you've installed manually, it should just be a case of editing the relevant user entry in your MongoDB (I'd recommend using a UI-based tool like Robomongo to do this if you're not familiar with the Mongo shell).
If you search the forums, you'll find various posts with more specific instructions to help you along further.