Cut chicken into 1 inch or so pieces. put it in a dish and pour the dressing over it. Marinate in the fridge for at least 20 minutes, or all day.
Cut your peppers, onion and pineapple if you are using into 1 inch pieces. You want everything to be similar size.
Pull out the chicken, and start threading everything on skewers alternating meat, veggies and pineapple if using. If you are using a wooden skewer, make sure you soaked them.
Put the prepared skewers on the grill, and rotate every 5 minutes or so for about 15-20 minutes, or until chicken is done.