You'll accrue .2 points (equates to 20 cents) for every dollar spent on qualifying products, look for "Rewards Points" on the product pages. To redeem rewards points, you need to be logged into your account.
When you're signed in, you'll see, on each product page that's eligible for points redemption, that you can redeem accrued points for eligible products once you have enough points to qualify for redemption of the product that you want to buy. There will be a "Redeem Points" button by the "Add to Cart" button.
You can apply accrued points to redeem them for eligible products once your points balance exceeds the points needed to redeem for the products you're interested in. Rewards points are good for up to six months from the date of each qualifying purchase. You can keep track of your Rewards points by signing into your account.