Hi Brian,
Your guitar has what's called a truss rod running the length of the neck. There is a hex nut under a plastic cover on the headstock that gives access to this truss rod. Use the appropriate sized allen wrench (you do NOT want to strip the nut) and first loosen the truss rod (turn it 1/8 of a turn counterclockwise). Then, if you want lower action, adjust 1/8 of a turn at a time clockwise until you are happy with the result. If you want higher action, adjust 1/8 of a turn at a time counterclockwise.
Be warned that a stripped or broken truss rod results in a VERY expensive repair (usually the neck is replaced)!
Good luck!