Hinweis
This article does not apply to verwaltete Benutzerkonten. To change your email address as a verwaltetes Benutzerkonto, contact the administrator for your company's identity provider (IdP). Your primary email address is the first one assigned to you in the IdP.
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Klicke in der oberen rechten Ecke einer Seite auf GitHub auf dein Profilbild und dann auf Settings. 
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Klicke im Abschnitt „Access“ der Randleiste auf Emails. 
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If you'd like to add a new email address to set as your primary email address, under "Add email address", type a new email address and click Add. 
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Under "Primary email address", use the drop-down menu to click the email address you'd like to set as your primary email address, and click Save. 
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To remove the old email address from your account, next to the old email, click . 
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Verify your new primary email address. Without a verified email address, you won't be able to use all of GitHub's features. For more information, see Verifying your email address. 
Next steps
- For reference information, see Referenz zu E-Mail-Adressen.