Please click on "Initial setup" and scan the generated QR code with your 2FA app, or use the generated "Secret" for this.
Then, please check if your 2FA app generates working codes using the "Check code"-button.

"Save"

You can use any TOTP-compatible 2FA app for this, such as Google Authenticator (Android, IOS) or Microsoft Authenticator (both are free).
Important: Please make a note of the "recovery codes" in case you lose your access data. For this you can also use the Copy to clipboard-button.
With "Check code" you can access the recovery codes again at any time.
You can use these recovery codes as a 2FA code when logging in, in case the generation via the Authenticator app does no longer work for you (change of mobile phone, etc.).

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