Lay the black plywood on the ground near the pool. This will be the base of your new pool-heating system.
Lay one of the black hoses on the plywood so that it winds back and forth across the plywood without overlapping itself. You will want the male end of the hose to hang in to the pool.
Connect the second black hose to the drain outlet on your pool. If there is no drain outlet on your pool that connects to a garden hose, simply drape the female end of this hose in to the water, away from the first hose's male end.
Connect the male end of the second hose to the water pump and then connect the female end of the first hose to the water pump. Now the water will be pumped out of the pool, through the hoses, heated by the sun, and will be returned to the pool.
To increase the efficiency of this method, you can set the hose that draws the water from the pool on a piece of plywood of its own.