When your Rok Box arrives, you'll notice that the default login username is PCAudioLabs.
There is no password set for this user account, and it is a local (not online) account, with Admin privileges.
If you wish to change your username, you can login to your Microsoft user account via the Windows Settings, which will change your username and profile image, and allow you to backup settings, files, and other details to your Microsoft account.
To do so, please follow instructions found here: