Google Authenticator is an app for generating one-time authentication (TOTP) codes. The application is supported by Android phones, iPhone and BlackBerry, and can also work without an Internet connection.
The user needs to install the application on the selected device to generate random codes. These codes must be entered in the appropriate field when changing profile settings, withdrawing funds or logging into an account. In addition to the mobile app, browser plugins are available (for example, an extension for Google Chrome).
Follow the link to learn how to set up Google Authenticator.