privacy-policy22, I see Sins listed on your account already. You should not have to manually add the registration. When you sign into Impulse with the same account as you sign in here with, you should be able to click the 'My Games' tab and find access to your game. If it does not show up for some reason, try closing Impulse and running the following file:
http://sd.stardock.com/curthendzell/fix_registrations.reg
Make sure to follow the link in Internet Explorer, as other web browsers will not handle the file type correctly. Once you follow the link, save the file and double click it to apply it. Then relaunch Impulse. You will need to re-login with your username/e-mail (either will work) and password.