To open the Camera app
From the Home screen, tap the Apps icon
(in the QuickTap bar) > the Apps tab (if necessary) > Camera 
.OR
Tap Camera
from the Home screen.OR
With the backlight off, touch and hold the Volume Down Key
(on the back of the phone).
TIP!
If you’ve set your phone to use the Swipe unlock
method, from the Lock screen, simply drag the Camera icon upward to open
the Camera app.