if you have your DRLs disabled its easy. just turn on your running lights and then click on the foglights. if you have a 97/98 you can just pull a fuse in your glove box. if a 99+ its a little more difficult.

if you dont have them disabled, you can find a slight click in between the headlights being on and the running lights. its kind of tricky to find, but it works just as well.