okay, pretty simple:
1. open hood
2. locate philips head screws holding grill down
3. remove them
4. using a flat head screw driver or knife, locate 2 plastic push-in screws closer to the inner part of the grill and remove them. don't lose these.
5. taking hold of the grill firmly, pull up and a little toward the car. this is due to the large plastic spikes that align the grill to the frame of the car.
6. after this, you'll notice that there are 2 plastic nubs in the bumper, this is where the grill attaches to the bumper. to put the grill back on, simply align the plastic spikes to the frame and slide it in, put the grill over the two nubs and press down. also push down the side tabs where the philips head screws were in.
7. tighten down the screws, and voila