Welcome to the Forum. Make sure you read the first two entries at the top of this Forum, as it gives you guidelines that will make it easier for others to help you. For example, using code tags, via the '#' symbol makes your code look like this:
#define RELAY1 8
#define RELAY2 9
void setup()
{
// Initialise the Arduino data pins for OUTPUT
pinMode(RELAY1, OUTPUT);
pinMode(RELAY2, OUTPUT);
}
void loop()
{
digitalWrite(RELAY1,LOW); // Turns ON Relays 1
delay(15000); // Wait 2 seconds
digitalWrite(RELAY1,HIGH); // Turns Relay Off
digitalWrite(RELAY2,LOW); // Turns ON Relays 2
delay(15000); // Wait 2 seconds
digitalWrite(RELAY2,HIGH); // Turns Relay Off
}
Placing it in a scrollable window makes it easier for all to read, plus it takes fewer nano acres on a page.