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 counterclockwis
Be warned that a stripped or broken truss rod results in a VERY expensive repair (usually the neck is replaced)!
To adjust the action you can also use a small allen wrench and lower the settles of the bridge.
You can also consider replacing the nut.
One last thing you can do is remove the screws that atach the neck to the body of the guitar and place a small piece of papper on the outter screws place to give it a little raise angle.