the spark plugs are screwed into the engine block and the top part of them is covered by a single wire, if you have a four cylinder engine, there will be four spark plugs, the wires will all go from the spark plug to a distributor cap and should pull straight off on each end, if you are replacing the spark plugs make sure not to change any of the wire locations
Assuming you mean no spark at the spark plugs; check for spark at the coil - if you have spark, then remove the distributor cap and check the rotor and contacts for corrosion. If you don't have spark at the coil, then either the coil is bad or you have a broken wire in the system. (Coils seldom go bad but there is always that possibility). Hope this helps.
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