On the rear of your camera to the top right is a mode selector dial. To the right of this there is a vertical rocker switch, press the top half to zoom in and the bottom half to zoom out.
Note that this model is extremely basic and crude. The zoom is only a digital zoom, not an optical one: this means that every time you zoom all that's happening is the camera magnifies the image and effectively reduces it's resolution dramatically from the maximum 5.1MP. You can reduce the loss of quality by using the mode selector to go into set up mode and then setting the photo quality to "High Quality" (two stars). You'll still lose the same number of megapixels when zooming, but the data compression on your photos will be lower than when using standard quality settings. By far the best way to use your camera is to never use the digital zoom at all; leave it set fully to "wide" and if you need to zoom just crop the image afterwards on your computer.
Your camera is better than nothing, but even a basic 2MP camera built into a mobile phone will usually take better pictures.
If you'd like to know more about your camera then you can download the user manual
here, courtesy of Retrevo.
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