Pour it slowly from a measuring cup while walking around the pool, holding the cup out as far away from the pool sides as you can, then stirring it up with a broom handle or your pole. If it's inground, you can also kind of "toss" it from a measuring cup, a little at a time, toward the center of the pool and especially into the deep end, following it up with a good brushing that will help distribute the bleach, just make sure that you don't splash it onto the side opposite where you're standing.

Janet