First (and this is very important), soak your sponge and squeeze out any excess water until no water drips—this will cause it to double in size.
Then, dip it into the liquid foundation you put on the back of your hand and use a dabbing motion—never smudge or swipe—to "bounce" the side of the sponge all over your face. Use the pointed tip of the sponge to blend out the foundation around your nose and eyes.