After you’ve registered one or more Linked Cards to your Simon+ Account, visit your Simon+ Account Dashboard or the “In-Store Cash Back” page on the Rewards Site. When you find an offer you'd like to use, tap “Activate”, which will link the offer to (all) your Linked Card(s) instantly.
You can also toggle between available In-Store Cash Back offers and In-Store Cash Back offer(s) you have activated on the “In-Store Cash Back Offers” page to keep track of which ones you’ve already added.