How can the pilot make it change direction? 

The control surfaces on the tail are called elevators. They tip the aircraft up or down.

The control surfaces on the wing are called ailerons. They make the aircraft roll.

The tail has another control surface called the rudder. It alters the direction in which the aircraft is facing.

How can the pilot make the aircraft turn the other way (to the right)?

To turn to the right, the pilot puts the right aileron up and the left aileron down. The aircraft tips slightly, and turns to the right.

In reality, the pilot will use a combination of controls to turn an aircraft. For example, the rudder and the ailerons are used together to make a smooth banking turn.

How does the pilot control Concorde? 

The pilot moves the elevons up and down to change direction. When they move in the same direction they act like elevators. When they move in opposite directions they act like ailerons.