Sit at the middle of the piano. Place your right thumb on middle C. This is the white key in the center of the piano next to two black keys. Place the remaining fingers on consecutive white keys D, E, F and G.
Position your left hand an octave below the right hand. The pinky will sit atop C, while the remaining fingers occupy a single white key each, up to G, which is played with the thumb.
Hold your elbows slightly below the line of the keyboard.
Arch your fingers as if you are holding a ball in your hand. This curved motion provides the essential elasticity to prevent your hands from cramping and getting tired. It also makes it much easier to move around the keyboard and jump from one octave to another.