To cook a frozen pizza in a toaster oven, first be sure your the oven is set to oven cooking and then preheat it to the specified temperature from the packaging. Then place the frozen pizza in the middle of the rack and cook for the specified time or until the pizza is cooked through.
If you are using a toaster oven to bake a frozen pizza, then follow the instructions on the box. To make a pizza from scratch, set the oven to about 400 degrees and keep an eye on it. It is done when the crust is golden brown and the cheese is melted.