To locate your license Key (aka Activation Key) and subscription information, you must first login to your Customer Dashboard. In your dashboard you can view your Subscription information, Setup Devices, and change your details too.
If this is your first time logging in, you won't see your license key right away. You will need to generate it.
Get Your License Key
First, get into your dashboard, and click on "Setup Devices", there are several links to choose from.
Next, click on the device type you want to setup, click on any of the options below.
Then you'll need to click "ACTIVATE YOUR LICENSE KEY"
Your license key will then appear, and you can use it to setup your devices.
To setup additional devices, just use the "Email Setup Link" and open the email from your device, and click then link. You'll be automatically be logged into the site and be able to grab your Activation Key.