Corolla taking off rotors

Specifics will depend on model year and if you are referring to the front or rear brake rotors. But in most cases, you need to remove the caliper first, then the torque plate (bracket that holds the caliper), then the rotor can be removed. Many times, there could be a significant amount of corrosion that forms around the hub - may take quite a bit of effort to free a stuck rotor, in those cases. A quality penetrating fluid and a couple of whacks with a mallet can help.