Put your blinkAll() and turnAllOn() function above void setup(). I do you a favor because there`s some error left (close bracket in front of function and undeclared redPin etc), and here goes the code:
void blinkAll (int red, int green, int blue) { // colour generating function
analogWrite(9, 255 - red);
analogWrite(10, 255 - blue);
analogWrite(11, 255 - green);
}
void turnAllOn (int red, int green, int blue) { // colour generating function
analogWrite(9, 255 - red);
analogWrite(10, 255 - blue);
analogWrite(11, 255 - green);
}
void setup() {
pinMode(5, OUTPUT); // sets the LED 5 to be an output
pinMode(6, OUTPUT); // sets the LED 6 to be an output
pinMode(A2, OUTPUT); // sets the LED A2 to be an output
pinMode(A4, OUTPUT); // sets the LED A4 to be an output
pinMode(A3, OUTPUT); // sets the LED A3 to be an output
pinMode(9, OUTPUT);// sets the redPin to be an output
pinMode(11, OUTPUT); // sets the greenPin to be an output
pinMode(10, OUTPUT); // sets the bluePin to be an input
blinkAll (255, 0, 0); // turn RGB red
delay (1000); // delay for 1 second
blinkAll (0, 0, 0); // turn RGB OFF
delay (1000); // delay for 1 second
blinkAll(0, 255, 0); // turn RGB green
delay (1000); // delay for 1 second
blinkAll (0, 0, 0); // turn RGB OFF
delay (1000); // delay for 1 second
blinkAll(0, 0, 255); // turn RGB blue
delay (1000); // delay for 1 second
blinkAll (0, 0, 0); // turn RGB OFF
delay (1000); // delay for 1 second
digitalWrite (5, HIGH); // LED 5 ON
delay (1000); // delay for 1 second
digitalWrite (5, LOW); // LED 5 OFF
delay (1000); // delay for 1 second
digitalWrite (6, HIGH); // LED 6 ON
delay (1000); // delay for 1 second
digitalWrite (6, LOW); // LED 6 OFF
delay (1000); // delay for 1 second
digitalWrite (A2, HIGH); // LED A2 ON
delay (1000); // delay for 1 second
digitalWrite (A2, LOW); // LED A2 OFF
delay (1000); // delay for 1 second
digitalWrite (A4, HIGH); // LED A4 ON
delay (1000); // delay for 1 second
digitalWrite (A4, LOW); // LED A4 OFF
delay (1000); // delay for 1 second
digitalWrite (A3, HIGH); // LED A3 ON
delay (1000); // delay for 1 second
digitalWrite (A3, LOW); // LED A3 OFF
delay (1000); // delay for 1 second
turnAllOn (0, 255, 255); //
digitalWrite (5, HIGH); // LED 5 ON
digitalWrite (6, HIGH); // LED 6 ON
digitalWrite (A2, HIGH); // LED A2 ON
digitalWrite (A4, HIGH); // LED A4 ON
digitalWrite (A3, HIGH); // LED A3 ON
}
void loop() { // run forever
}