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The instructions say:
Scan This Barcode With Your App

Configure your authenticator app to receive security codes from Groups.io. Don't have an authenticator app? Choose from a list of our recommended apps: Google Authenticator, Duo Mobile, Authy, or Windows Phone Authenticator.

Note: If you enable two-factor authentication, you will not be able to log in using Facebook, Google or the Email Me a Link to Log In functions.

Scan this image using your authentication app. If you can't use a barcode, enter the code 2GMQRKQN357CGEW7U2GIOHEERBI3OM47 instead.

/account
Security from the menu on the left.

Frances