Login information is top-level; changing your login information on one Stack Exchange site will automatically change it for all other Stack Exchange profiles associated with that account.
You must be logged into your account when you begin this process. (This information is also available in the Help Center.)
Open up your user profile page (by clicking on your user name at the top of the screen) and click the "my logins" link above the bio box on the right hand side.
You should see a list of all of your logins.
To add a new login, click "add more logins..." at the bottom of the box. Choose the new login from the list and follow the steps to confirm.
You can remove your obsolete OpenID login by clicking the same "my logins" link, then clicking "remove" next to the login information you'd like to delete.
If you are adding a Stack Exchange OpenID, you will receive a confirmation email. You must click the link in the email to confirm your email address before the Stack Exchange OpenID will show up under "my logins". Please make sure that you are already logged into your account when you click the confirmation link; otherwise, you will create a new account that needs to be merged with your old one.
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