The only dumb question is the important one you don't ask... and about 3 years ago I asked the very same question cos it wasn't obvious to me, either
However, sydneysiders is correct.. go to the"My account" tab and check it there, or alternatively you can open Impulse, click the help question mark and select 'Look up serial number'... enter the email you used to open your account and Stardock support will email you with all your registration details/Serial No's.
