You'll need your phone with an authenticator app installed.

In the Modern web app

1. Sign in to webmail at mail.redmail.com and open Preferences.
2. Choose the Two-Factor tab.
3. Click Set up two-factor authentication.
4. Add your account to your authenticator app:
   • on your phone, tap Open in your authenticator app, or
   • on a computer, open your authenticator app, choose to add an account by entering a key, and type in the key shown on screen. The spaces don't matter.
5. Your app now shows a six-digit code for your redmail.com address. Type it into the box and click Turn on.
6. You'll see ten recovery codes. Save them now: print them, or store them in a password manager. They're shown only once. Each one gets you in once if you ever lose your phone.

In the Classic web client

Open the Security tab at the top of the screen and follow the same steps.

There's no QR code to scan. Use the link on your phone, or type the key in by hand.