If you have already set up SMS authentication, see How can I change my 2-step verification method? FAQ .
If this is your first time logging in to your Voyager account since 2-Step Verification has been implemented, follow the steps below: First, if you have not done so already, download one of the free Authenticator apps such as Authy, Google Authenticator, or Microsoft Authenticator. Once you have downloaded an Authenticator app, log in to your Voyager account or navigate to the main Markets screen. You should be prompted to set up 2 Step Verification: Select “Enable Authenticator Verification”. Tap “Setup in Authenticator” (which should launch your Authenticator app) to add token or you can add the token in your Authenticator app by manually copying the key provided or by scanning the QR code. Hit “Continue” and follow the on-screen prompts to provide the TOTP code. Be sure that you save your new backup recovery codes.