Please make sure you have downloaded the Google Authenticator App to your phone and understand how it works PRIOR to turning on 2FA in your wallet.
Once the app has been set up on your phone click the button to turn on 2FA
Please make sure that you DO NOT click done on the 2FA section UNTIL you have scanned the QR Code with your Google authenticator App or used the key to enter it manually.
Please make sure you store your manual key somewhere very safe! If people get a hold of this they can steal your tokens.