Once upon a time everyone who rode a motorcycle was intimately familiar with the mechanics of removing and replacing spark plugs, especially if they rode a two-stroke. Everyone carried a spare set of spark plugs, every motorcycle came with a spark plug wrench, and everyone knew how to 'clean the spark plug', as one old-timer of my acquaintance used to call it. Fortunately that particular Saturday morning ritual is long gone and little missed part of riding a motorcycle, but that doesn't mean you shouldn't have at least a passing familiarity with the subject of replacing or cleaning your spark plugs.
First you start by locating the spark plugs. I know that sounds silly, but these days the spark plugs could be buried deep between the fins, stuck under the fuel tank, or hidden under multiple layers of plastic. The only sure thing is they're going to be located somewhere in the cylinder head.
Remove the coil's high-tension wire. Grasp the lead at the cap, impart a slight twist, or wiggle the cap to free it from the spark plug, and it should come straight up. In some instances the coils attach directly to plug; those might have to be unbolted before they can be removed.
To prevent dirt from entering the engine use a blast of compressed air to blow debris away from the spark plug. If you don't have a compressor, use a canned air duster or even a soda straw.