Switch to shutter priority instead.
Here is a quick guide. There are TONS of videos etc on Youtube if you search for it.
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What shutter speed should you choose? Well, it depends on the speed at which your subject is moving, so you need to experiment. But generally speaking, 1/320 second should be plenty for all but the fastest subjects (race cars, boats, and so on). For very slow subjects, you can even go as low as 1/250 or 1/125 second.
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http://www.dummies.com/how-to/conten...kon-d5300.html