When signing in to www.kona.com, you will see options at the bottom to “Sign in with Facebook, Google, or Yahoo”. Click on the icon for the application you want to use and Kona will walk you through the process. After authenticating your account, if necessary, you will be brought directly into Kona each time afterward.
Important Note! Prior to using this feature for the first time, it’s recommended to add the email addresses you use with your Facebook, Google, or Yahoo accounts to your Kona profile. Check out this knowledge base article for more information: http://support.kona.com/entries/21853651-how-can-i-link-all-my-email-addresses-to-my-kona-profile.