Verifying your email address
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In the upper-right corner of any page on GitHub, click your profile picture, then click Settings.
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In the "Access" section of the sidebar, click Emails.
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Under your email address, click Resend verification email.

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GitHub will send you an email with a link in it. After you click that link, you'll be taken to your GitHub dashboard and see a confirmation banner.
 
Next steps
For reference information, see Email addresses reference.
If you are having trouble verifying your email address, see Troubleshooting email verification.