You just have to get behind the light box and pull the bulb out the back. However some of the newer vehicles require replacement of the whole light box in which case you would still remove the fasteners from the back side. This way you would be able to pull it out of the body.
You unscrew the plastic from the car, remove the plastic, remove wire/bulb assembly from the hole and then replace the bulb in the assembly. Then put the bulb back in and back track on what you just did.
Begin by finding the back of the bulb housing, grip the back of the current bulb and twist. The only thing holding the bulb on is a clip, just replace.
No tools required, there are three black wing nuts above headlight, take these off and wiggle the turn signal. The turn signal assembly is located by two pins at the rear pull it forward a bit as you wiggle it. The bulb pulls out.
Go to the local auto store and buy the correct bulb. If it is in the front of the car you just get to it from inside the hood. Pull the assembly out and take out the bad bulb. In the rear, get to it from inside the lift door.