To use this Purina Pro Plan cat food, simply open a can and serve it to your cat in a clean bowl. You can feed it to your cat as a main meal or mix it with dry cat food for added variety. Remember to adjust the serving size according to your cat's age, weight, and activity level. Keep the unopened cans in a cool, dry place. Once opened, cover the can and refrigerate the remaining food. Use the refrigerated food within 2 - 3 days. Always provide fresh water for your cat. If your cat has any specific health issues, it's a good idea to consult your vet before making any major changes to their diet.