This tutorial requires you open the Camera app. To access the camera from the home screen, select the
Camera app. To access the Camera app from the lock screen select and drag the
Camera icon up. You can also access the camera by double-pressing the Power/Lock button.
Select the desired area of the photo you wish to focus on. A circle will appear when the area is selected.

Select the Capture icon.
Note: Alternately, you can take a picture by pressing one of the Volume buttons. 