Preheat the oven according to the cooking directions for the pizza. Line a pizza pan or baking sheet with parchment paper. Place the pizza on the pan.
Spread the buffalo sauce over the top of the pizza. Top with the buffalo chicken, shredded Mozzarella, and blue cheese.
Place the pizza into the oven and bake according to the package directions. Remove from oven and let sit for 3 minutes before slicing and serving with Ranch dressing.