It's easy to cook a frozen pizza in a microwave. Most frozen pizzas have microwave directions right on the box.
Remove the pizza from its box and take off the cling film.
Turn the pizza tray over so the shiny, grey side is showing, or get a microwaveable dinner plate.
Put the pizza in the microwave. Cooking times vary, so follow the instructions on the box. The pizza is done cooking when the cheese has melted.
Cut your frozen pizza into slices and cook in a microwave pizza warmer, which can be purchased online.