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Open Google Authenticator, 1Password or Authy and enter the 6-digit code. No phone at hand? A backup code works too.
From now on you need a code from your phone in addition to your password. Scan the QR code with your authenticator app, then enter the code it shows.
Each code works exactly once if you do not have your phone. Store them safely now, e.g. in your password manager. They will never be shown again.