1
As far as I can tell from the picture you share that you don't have an external power supply connect to the shield to drive the "12 DC motors".
Read https://learn.adafruit.com/adafruit-motor-shield/power-requirements for better understanding on how to power the motors.
1
Assuming that your motor is connected to pin 8, and you want to set that signal high, you have to define it:
#define motor 8
void setup() {
pinMode(8, OUTPUT);
}
void loop()
{
digitalWrite(motor, HIGH);
// put your main code here, to run repeatedly:
}
Since you use it also in setup, also replace it there:
#define motor 8
void setup() {
...
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