Creating an stepper object within a class

it needs the namespace.

compiles, but untested:

#include <AccelStepper.h>

#define MAX_SPEED 500

// Class for each finger
class Finger {
  public:
    // Constructor for each finger object
    Finger(int stepPin, int dirPin) :
      stepper(AccelStepper::DRIVER, stepPin, dirPin)
    {
      stepper.setMaxSpeed(MAX_SPEED);  // are you sure this is a good idea in the constructor?
    }
    AccelStepper stepper;
};

Finger Thumb(2, 3);

void setup() {
}

void loop() {
  //Example of how I want to use the stepper finger class
  Thumb.stepper.moveTo(90);
}