Sorry to hear this, we know this can be frustrating!
Try logging out the account first by using this link - gainful.com/logout , then try signing in again. If you are redirected to the quiz or a checkout page then you are using the wrong email address. Try a different email or send us your shipping address at email@example.com so that we can locate your correct email login.
Still, having trouble? call us at 415-991-7243 ( M-F from 9 am to 5 pm PST) we are happy to help :)