Login to your account and press my account on the top right.
You can enable or disable the two factor authentication by choosing the right option for you:
Read the appearing QR code with the authenticator app on your phone. Authenticator apps, such as Google Authenticator, Microsoft Authenticator, and Authy are available from iPhone and Android app stores.
Follow the instructions by inserting the password generated by your two factor app:
Two factor authentication is now ready to use.
To disable the function, choose the disable button and insert verification code generated by your autherication app: