To mirror your Android device to your computer using Reflector, you need to install Reflector or Reflector Teacher on your Mac or Windows computer.

If your Android device has the option to access the native Cast option, you do not need to install anything on the device in order to mirror.

Alternatively, you can download the Google Home application on the device and use this to mirror to Reflector.

Directions to mirror via the native Cast option or Google Home can be found in the article below. 

Mirror Android to Reflector