The driver should tell the guard they are delivering the car (make sure the driver has the name of the lead on the reservation; they may also need the room number, so either have them call you for it or just give it to them in advance).
You can simply use the right lane marked for "Resort Guests" when entering, and use your Magic Band to raise the gate.
You don't have to register the car, or even let the Front Desk know, as they no longer use the resort parking signs for your windshield