You will be able to opt-in or out of two-factor authentication (2FA) at any time by going to the "My Account" section of your account and then "Security." You'll be asked to provide your phone number and will then be sent an authentication code which you will need to input
If you don't receive the authentication code, you'll need to wait one minute before sending a new code, as there could be a slight delay from when you request it to when you receive it.
Please note--Reach out to support if 2FA is very suddenly turned off or if you need help due to a lost phone or changed phone number.
It's helpful to consider turning on two-factor authentication on your account, as it can protect your account by making it more difficult to access.