The new command defined on page One-16 is public static void takeTheField(Athlete athlete). This is not a new method defined inside class Athlete, so it is not called by maria.takeTheField(). This is a class method as oppossed to an instance method such as jumpRight(). The class method is specific to a particular lab.
The correct call is:
takeTheField(maria)
The Athlete maria is now an argument (or parameter) to this new command.
This new command takes the athlete from position A and moves to position B.