It's towards the front of the motor on top. You'll see a wire that has a 90 deg elbow type fitting on it. Pull the wire and fitting out. It's about 4 inches long. The spark plug is down in the hole. Use the spark pluck socket that came with the quad. It is located under the seat in the tool bag.
Once you've got the socket seated onto the spark plug, then use the open end wrench in the tool bag to turn the socket. I just had to check my plug last night, and did it without taking anything off the quad. Although it did take me a while to find the plug. They did a good job of hiding it.
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