Signed up for Comicvine go this instead.

I signed up for Comic Vine but was registered to Giant Bomb instead. The comformation email came from & for Giantbomb. I want Comic Vine not Giant Bomb. Please help.

Pretty sure it's the same login. Just try using the username/password you created on Comic Vine.

@jedisenshi: You appear to be registered for both, have you tried using the same login details you used on Giant Bomb to get into Comic Vine?

They know, at least.