Adafruit Motor Shield V2.0 Manual page 7

You need to do some preparing first: - Set SEN_A and SEN_B, connect the left 2
pins together with a jumper. - Connect MB_EN together with a jumper, as we are no
going to use an external power.
Find the pin definitions of you stepper, and connect it to the OUTPUT of the shield.
As below:
Stepper
A+
A-
B+
B-
Then open stepper_test example in the library, upload it to Seeeduino V4, then you
will find your stepper move.
/*
* Stepper test for Seeed Motor Shield V2
* loovee @ 15 Mar, 2016
*/
#include <Stepper.h>
// change this to the number of steps on your motor
#define STEPS 200
// create an instance of the stepper class, specifying
// the number of steps of the motor and the pins it's
// attached to
Stepper stepper(STEPS, 8, 11, 12, 13);
// the previous reading from the analog input
int previous = 0;
void step(int steps)
{
digitalWrite(9, HIGH);
Motor Shield
OUT1
OUT2
OUT3
OUT4