Most digital cameras have a two-stage shutter button. When you press it halfway down, it sets and locks focus and exposure. Some cameras beep and illuminate a lamp or frame in the viewfinder when these readings are locked in. If you don't release the shutter button you can then recompose the image and the settings remain unchanged. This procedure normally locks exposure too, but if you first use AE Lock to lock exposure, you can then lock focus independently.
If the camera doesn't take the picture after fully depressing the shutter button, it most probably means that you are too close to the subject for the camera to focus on it (Read the user manual to find out your camera minimum focusing distance). Fix the problem by release the shutter button, stepping back a foot or two, and then pressing the shutter button again.
Step-by-step guide:
1. Look through the viewfinder and position its focus point on the main subject.
2. Press the shutter button halfway down, until the green focus-OK lamp in the viewfinder eyepiece glows steadily or the focus lock beep-signal is heard.
3. Holding the shutter button halfway down, reorient the camera so that your desired composition appears in the viewfinder.
4. Press the shutter button all the way down to take the picture.
5. Done!
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