If you have your Ford account all set up and plug in to charge you can use your free charging and pay the higher rates after the free is used up, it should all just work by plugging in, no other interaction.
If you are having to pay for it and want the cheaper rates you need to sign up for an account and activate the charger before plugging it in to your truck.
If you are having to pay for it and want the cheaper rates you need to sign up for an account and activate the charger before plugging it in to your truck.