Login to account to use rewards.
For instore use go to Account settings and look for the account phone #. Then when checking out at store simply give that phone number to clerk and say you’d like to use your rewards.
Kmart Corporation, is an American big box department store chain headquartered in Hoffman Estates, Illinois, United States. The company was incorporated in 1899 as S. S. Kresge Corporation and renamed Kmart Corporation in 1977. The first store with the Kmart name opened in 1962.