Be VERY careful where you put the floor jack before you attempt to lift your car up. I made a HUGE mistake and didn't put it in the right spot and partially broke off the lower side "rocker panel" as they call it. When I brought it in to my Mazda dealership for repair the mechanic laughed and looked at me like I was an idiot. I showed him the illustrations in the manual -- which I was following step by step -- and how it didn't take into account the "rocker panel" and confused me. He smirked and said, "Yeah, but it's still common sense." I beg to differ. I am not an expert on cars and for all I knew the "rocker panel" was what the illustration was referring to. However, when I began to jack it up I heard a cracking noise so I stopped, but it was too late as the damage had already been done.
The bottomline is that there is a thin metal bar that goes down the side that you need to find. It's in past the "rocker panel" and it is the ONLY thing you put your floor jack on. Like the previous poster said, it's by the wheels and you look for the indentation. If you put it anywhere else, it will bend the metal or snap off your "rocker panel." Then the next thing you know you'll be online using the term "rocker panel" over and over and believe me you DON'T want that to happen!