Open Settings and find Security.
Turn it on
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Choose Set up authenticator app.
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Scan the QR code with Google Authenticator or a similar app. Cannot scan? Open Cannot scan? Enter the key by hand.
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Enter the 6-digit code the app shows, then Verify and enable.
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Save your recovery codes (Copy all) somewhere safe. They are the way back in if you lose your phone.
Two-factor is only real once that code is confirmed.
Other security actions
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Change password signs out every other device.
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Login history shows recent sign-ins. Unrecognised one? Change your password.
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Turning two-factor off asks you to confirm first.
Mayarin support never asks for your code or recovery codes.