You can replace each fog lamp by reaching under the front bumper cover near the center, where there's an opening in the splash shield.
But since you're working with halogen lamps (that need to be kept 100% clean), it's not easy to keep each bulb from touching anything while you try to guide it into the socket. You won't really be able to see what you're doing.
If you're careful, you can squeeze the three tabs holding each fog lamp assembly inside the bumper cover, then push the assembly outward. Then you have easy access to the bulb socket. The assembly simply snaps back in when you're done.
Clean each new bulb with isopropyl alcohol, and don't let the bulb touch anything, including the opening in the lamp housing. Any dirt or grease on the bulb will lead to early failure.
Also, since I tried the Putco bulbs myself, be careful of the contacts. The Putco connector contacts are slightly different from the standard H16 contacts.
Good luck. I didn't have such good luck with the Putco bulbs. One of them turned dim orange after only one day, and if I hadn't pulled into the parking lot of a store with a glass window large enough to let me see the front of the car, I'll bet that bulb would have melted the housing.
The top one is the one that failed. If you look closely at the lower contact on the top lamp, you can see a small crack in the quartz.
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