Very easy. Look at this first and you will get the idea. Yours possibly has another small terminal on the opposite side from this one but no matter jump to the one with the small wire going to it (probably black).
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If it turns over you need to check for power at the small wire when someone turns the key, make sure battery terminals are clean and battery charged first before doing anything.
If it doesn't turn over you may be dealing with a locked up starter or bad solenoid. Try it and post back.