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Log in to your PDAX account and click the Enable 2FA button that you can find in your portfolio page.
As an alternative step, you can also click the account icon that you can find on the upper right corner of your screen, go to Settings, and click Security.
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Click the Add New button under the YubiKey section.
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Insert your YubiKey into your computer’s USB port once a pop-up window appears asking you to Add New YubiKey.
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Press the gold disk in the middle of your Yubikey or the YubiKey button (depending on the type of YubiKey that you’re using) once its light starts to blink. This will automatically generate random characters on the pop-up window field.
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Click Confirm to proceed. Your YubiKey will then be added in the list as Yubikey Id 1.
NOTE: PDAX requires all users to enable 2FA (via OTP or YubiKey) when withdrawing cryptocurrencies from their PDAX accounts.