Each account has a two-factor authentication of sort. The default 2FA is done via a code sent to your mailbox. If you wish to update the security, you can set up 2FA via an app.
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Go to Settings > Security > Two-factor Authentication (here)
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Click Setup Using an App
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Confirm your password
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Scan the QR code, or use a code to enter into the verificationa pp
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Enter the verification code from the app
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Enter the verification code from your email for final confirmation
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Make sure you back up your recovery code
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You're all set!