There are two different options for setting your calorie range. One is that your range changes based on how much fitness you track. The other is that your range stays the same, and is based on a calories burned goal. If you would like to change to the other method, click on Account Preferences at the top left of your Start page and you can do it from there.
Hope that helps!
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford