With Pampers Rewards, you need to download an app to scan in the in-pack codes. I did it and it's actually super easy. You get 100 points for signing up, 50 more when you scan in your first code. The one hitch is that while Pampers Rewards has loads of stuff you can get with relatively few points, it actually takes a lot of freaking points to earn a pack of free diapers. I did the math, and it would take 16 purchases of 166-count Pamper Swaddlers Size 4s to earn the 2100 points required to get a free pack. Now that's a lot, but also, you're going to buy the 16 packs anyway, so you may as well get one for free.