Using your OpenID to access your Google Account
How to get started
Go to your Accounts settings page and look for a link to Change federated sign-in. If you have the link, click it to start the setup process.
During the process, your identity provider will need your consent to share your identity with Google.
If you see an error page, your account is not able to use OpenID. It is only available if you are signed in to a Google Account for certain domains, such as hotmail.com, yahoo.com, and aol.com. It is also only available in certain languages depending on your domain name. In addition, some accounts cannot use OpenID because they are using advanced features that do not work with OpenID.