Short Answer: Open Security, click "Enable 2FA", scan the QR code or use the displayed Key in your authentication (TOTP) app, enter your Current password and the 6-digit code, then click "Verify".
PreRequisites
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Be signed in to your account.
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Have an authentication app that supports TOTP installed (mobile device recommended).
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Know your account password.
Steps
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Open My Account and go to the Security tab.
The Security page appears with the Two-factor authentication section. -
Click the "Enable 2FA" button. The "Set up two-factor authentication" modal opens.
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Scan the QR code displayed in the modal using your authentication app.
Your app adds the account and generates a rotating 6-digit code. -
If you cannot scan the QR code, copy the Key shown under "Or, Enter code manually :" and add it manually in your authentication app.
The account is added to your app using the manual key. -
Enter your Current password, then type the 6-digit code from the authentication app into "6 digit-code".
Both fields contain valid values. -
Click "Verify" to complete the setup.
Two-factor authentication is enabled, and the Security page will now show "Disable 2FA".
Troubleshooting
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The 6-digit code is rejected during verification.
Likely Cause: The code expired or the device clock is out of sync.
Action: Wait for a new code, ensure your device time is automatically synced, or re-scan the QR code / re-enter the Key and try again.
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You cannot scan the QR code.
Likely Cause: Camera permission is blocked or the device has no camera.
Action: Use the Key shown under "Or, Enter code manually :" to set up the authentication app manually.
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Verification fails due to a password error.
Likely Cause: The Current password was entered incorrectly.
Action: Re-enter your account password carefully and try verifying again.
Note: After enabling 2FA, generate and securely store backup (recovery) codes for emergency access.