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 plastic wrap.
Turn the pizza tray over so the shiny, gray side is showing, or get a microwavable 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.