Licenses allow devices to be activated for a prepaid period of time. If you purchased or received a license key from a Revel Digital reseller. Log into your Revel Digital account here: https://as1.reveldigital.com and follow instructions below to activate your license.
Register your device.
You will not be billed for registering your device. This YouTube video provides a step-by-step on registration:
Select Service Level
Open the device details page, and click Change Service Level
Click 'Click here to activate' and enter your key