An authenticator app is an application you can install on a smartphone or tablet that generates temporary verification codes. You only need to install an authenticator app if you choose to use it as your MFA method.
To connect your authenticator app to your FOREVER® Account you may be asked to scan a QR code, or type in certain setup information from your screen. Most authenticator apps have an easy-to-follow guide on the screen to help you through the process, otherwise you can search online for steps on your specific app.