How do I remove login credentials (emails or OpenIDs) from my account?
For more information, see "How do I add or move login credentials from my account?" in the Help Center.
migrated from stackoverflow.com Sep 16 '09 at 16:46
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On most sites, the remove login feature has been moved. You now must go to a Q&A site, such as stackoverflow.com, then go to your profile -> edit profile and settings -> my logins.
You will now see the remove button, like the below:
Note: changing your login methods on one site will change your login methods for all sites you currently use. (source)
As for the rest of the sites with the older design, according to this answer: