Your app will not be able to access all offers when it does not have a network connection. For coupons you're sure to want to have access to when you're offline, we strongly recommend using the Favorites feature.
To quickly Favorite merchants, tap the little plus that appears on the right of your screen, while viewing any list. You'll see that once you Favorite a merchant the plus turns from grey to orange.
From your home screen you can get to your Favorites by tapping the Collections tab, and then tapping on you Favorites collection.