Go to your panel and go to your preferences
At your preferences you should see an Email address. Make sure that email address is the same as the the google account you are trying to link. If it is not the same click on the wrench to change it.
After you make sure your Email is all setup, you want to log out of your account
Next you Choose the google login option and select your Google account when prompted. This will give you several Errors. You will need to spam this about 5 times or more for it to finally work.