Setting up devices over again

After you setup a device like the Motion Sensor and you set it up to notify you that you want it to send you notifications when there is motion, you decide you want it to do something differently. How do you go about changing it? For example, I have my Motion Sensor set to notify me when there is motion. Now, I want it to read the motion and enable the lights. Do I have to reset the entire unit and go through the tutorial again or, is there an easier way?