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Log in to your American Express online account and click on "Offers For You," then click "Save Offer" to activate it. Some cardholders may not receive all offers (YMMV). Also, you generally need to be a cardholder in good standing for at least a few months to see these offers.
If you don't see it there, you can also sync your eligible AmEx card with Twitter and send a short Twitter message with #AmexWalmart.