Either a 'Tee' to hold the ball on 3 plastic fingers, or a human placeholder. The "Tee" is not allowed in kicking field goals and points after touchdowns.
The position is called 'holder'. Usually teams use their punter or back-up quarterback for the role, somebody who has time to hang around with the kicker on the sideline and help them warm up.
You cant hold the ball at all. It is classified as a carry and is a point for the other team. I hope this helped!YOU CAN ONLY HOLD IT WHEN YOY ARE GOING TO SERVE AND YOU CN HOLD IT FOR ONLY 8 SEC.