you put a little amount of that foundation on the outside of your hand. Then you massage it , if there was no difference in skin color between the area you applied the foundation on and the other parts of the hand that's the right one for you.
some people say if you put some on your cheek and go outside you can tell if they match your skin color but i would just put it on your arm to see if it matches
You can go to Macy's and I believe they have workers there specifically so that they can show you how to put the make-up on, and what would look best.
Just open it, take a little and put it on your hand/arm to test it or hold the bottle up to your skin and see if it resembles it
Go to mac