Navigate to 'Security' under 'Account Center'.
Locate 'Two-Factor Sign In'. Click 'Enable'.
Enter the Two-Factor Authentication code once the authentication page appears (or mobile verification code if Google Two-Factor Authentication is not enabled).
The system will enable the function once you pass the authentication.
*Likewise, when you need to disable Two-Factor Sign In, all you need to do is click 'Disable'.
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