Two factor authentication can only be set up on a user/admin account if they are the one signed in.

Click on your user account in the upper right hand corner of the screen.

Switch the button from "Not required" to "Required"

You can scan the QR code in your authenticator app.

Or you can manually paste the key into your authenticator app.

Press copy the code from your authenticator app.

You'll know 2FA has been successfully set up when you see "TOTP successfully configured" in the bottom right hand corner of the screen.

How to set up 2FA