You can find the Comodo Internet Security Pro key in the One.com control panel under Office 365 or Security services.
The standard activation process is handled through the within the software interface: comodo internet security license key link
Copy the alphanumeric string from your email and paste it into the field. You can find the Comodo Internet Security Pro key in the One
Click "Next." The software will communicate with Comodo’s servers to verify the subscription. comodo internet security license key link