You can get on Kroger/Payless's website and sign up. Be sure to have your Loyalty Card when you do. Sign up HERE
There are coupons available on the website that you can "clip" and they will load to your card. Then when you scan your card at the register, the coupons automatically come off. Now, unlike Meijer's mperks, you cannot use a manufacturer's coupon in combination with the Loyalty card coupons. So, if you have a manufacturer coupon that you really want to use (better coupon, can be doubled, is getting ready to expire), be sure to NOT load the coupon on your loyalty card. They come off before any coupons you hand the cashier.
Kroger / Payless does double coupons up to 50 cents also!