You control the airplane around three axes of rotation: lateral, longitudinal and vertical. All three pass through the center of gravity (note the CG symbols). The lateral axis of your airplane extends from wing tip to wing tip, and you control the pitch (nose up-nose down) attitude of the airplane by use of the elevator control. As you apply back pressure to the control wheel (or yoke) the elevator deflects upward and the air passing over it pushes the tail down. Note that control movement using a stick is exactly the same as when using a control wheel.